diff --git a/annotations/build.gradle.kts b/annotations/build.gradle.kts
new file mode 100644
index 000000000..0f69c7777
--- /dev/null
+++ b/annotations/build.gradle.kts
@@ -0,0 +1,7 @@
+plugins {
+    id("kotlin")
+}
+
+dependencies {
+    implementation(Deps.kotlin.stdlib)
+}
diff --git a/annotations/src/main/kotlin/MultiSource.kt b/annotations/src/main/kotlin/MultiSource.kt
new file mode 100644
index 000000000..e82273f00
--- /dev/null
+++ b/annotations/src/main/kotlin/MultiSource.kt
@@ -0,0 +1,5 @@
+package eu.kanade.tachiyomi.annotations
+
+@Retention(AnnotationRetention.SOURCE)
+@Target(AnnotationTarget.CLASS)
+annotation class MultiSource
diff --git a/buildSrc/.gitignore b/buildSrc/.gitignore
new file mode 100644
index 000000000..67bcc2f72
--- /dev/null
+++ b/buildSrc/.gitignore
@@ -0,0 +1,2 @@
+.gradle/
+build/
diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
new file mode 100644
index 000000000..3d7a9541b
--- /dev/null
+++ b/buildSrc/build.gradle.kts
@@ -0,0 +1,7 @@
+plugins {
+    `kotlin-dsl`
+}
+
+repositories {
+    jcenter()
+}
diff --git a/buildSrc/src/main/kotlin/Deps.kt b/buildSrc/src/main/kotlin/Deps.kt
new file mode 100644
index 000000000..efa5fb004
--- /dev/null
+++ b/buildSrc/src/main/kotlin/Deps.kt
@@ -0,0 +1,6 @@
+object Deps {
+    object kotlin {
+        const val version = "1.3.72"
+        const val stdlib = "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$version"
+    }
+}
diff --git a/common.gradle b/common.gradle
index 481780a54..219279952 100644
--- a/common.gradle
+++ b/common.gradle
@@ -62,6 +62,8 @@ repositories {
 }
 
 dependencies {
+    compileOnly project(":annotations")
+
     // Lib 1.2, but using specific commit so we don't need to bump up the version
     compileOnly "com.github.tachiyomiorg:extensions-lib:a596412"
 
diff --git a/settings.gradle b/settings.gradle
index dc61dc57a..88fd7b507 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1,3 +1,5 @@
+include(':annotations')
+
 include ':lib-ratelimit'
 project(':lib-ratelimit').projectDir = new File("lib/ratelimit")
 
diff --git a/src/all/boommanga/src/eu/kanade/tachiyomi/extension/all/boommanga/BoomMangaFactory.kt b/src/all/boommanga/src/eu/kanade/tachiyomi/extension/all/boommanga/BoomMangaFactory.kt
index 3ec73df65..9bede020c 100644
--- a/src/all/boommanga/src/eu/kanade/tachiyomi/extension/all/boommanga/BoomMangaFactory.kt
+++ b/src/all/boommanga/src/eu/kanade/tachiyomi/extension/all/boommanga/BoomMangaFactory.kt
@@ -1,11 +1,13 @@
 package eu.kanade.tachiyomi.extension.all.boommanga
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
 import eu.kanade.tachiyomi.source.model.SManga
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 
+@MultiSource
 class BoomMangaFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         BoomMangacom(),
diff --git a/src/all/comicake/src/eu/kanade/tachiyomi/extension/all/comicake/ComiCakeFactory.kt b/src/all/comicake/src/eu/kanade/tachiyomi/extension/all/comicake/ComiCakeFactory.kt
index 34541018e..5f685c3b1 100644
--- a/src/all/comicake/src/eu/kanade/tachiyomi/extension/all/comicake/ComiCakeFactory.kt
+++ b/src/all/comicake/src/eu/kanade/tachiyomi/extension/all/comicake/ComiCakeFactory.kt
@@ -1,8 +1,10 @@
 package eu.kanade.tachiyomi.extension.all.comicake
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
 
+@MultiSource
 class ComiCakeFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         LetItGoScans(),
diff --git a/src/all/emerald/src/eu/kanade/tachiyomi/extension/all/emerald/EmeraldFactory.kt b/src/all/emerald/src/eu/kanade/tachiyomi/extension/all/emerald/EmeraldFactory.kt
index 715998ceb..2042018ac 100644
--- a/src/all/emerald/src/eu/kanade/tachiyomi/extension/all/emerald/EmeraldFactory.kt
+++ b/src/all/emerald/src/eu/kanade/tachiyomi/extension/all/emerald/EmeraldFactory.kt
@@ -1,8 +1,10 @@
 package eu.kanade.tachiyomi.extension.all.emerald
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
 
+@MultiSource
 class EmeraldFactory : SourceFactory {
     override fun createSources(): List<Source> = languages.map { Mangawindow(it.first, it.second) } + languages.map { Batoto(it.first, it.second) }
 }
diff --git a/src/all/fmreader/src/eu/kanade/tachiyomi/extension/all/fmreader/FMReaderFactory.kt b/src/all/fmreader/src/eu/kanade/tachiyomi/extension/all/fmreader/FMReaderFactory.kt
index 319e3663b..2e5c88032 100644
--- a/src/all/fmreader/src/eu/kanade/tachiyomi/extension/all/fmreader/FMReaderFactory.kt
+++ b/src/all/fmreader/src/eu/kanade/tachiyomi/extension/all/fmreader/FMReaderFactory.kt
@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.extension.all.fmreader
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.POST
 import eu.kanade.tachiyomi.network.asObservableSuccess
@@ -21,6 +22,7 @@ import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import rx.Observable
 
+@MultiSource
 class FMReaderFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         LHTranslation(),
diff --git a/src/all/foolslide/src/eu/kanade/tachiyomi/extension/all/foolslide/FoolSlideFactory.kt b/src/all/foolslide/src/eu/kanade/tachiyomi/extension/all/foolslide/FoolSlideFactory.kt
index 6582de7b2..4309af024 100644
--- a/src/all/foolslide/src/eu/kanade/tachiyomi/extension/all/foolslide/FoolSlideFactory.kt
+++ b/src/all/foolslide/src/eu/kanade/tachiyomi/extension/all/foolslide/FoolSlideFactory.kt
@@ -7,6 +7,7 @@ import android.support.v7.preference.PreferenceScreen
 import android.widget.Toast
 import com.github.salomonbrys.kotson.get
 import com.google.gson.JsonParser
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.extension.BuildConfig
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.source.ConfigurableSource
@@ -24,6 +25,7 @@ import org.jsoup.nodes.Element
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
 
+@MultiSource
 class FoolSlideFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         JaiminisBox(),
diff --git a/src/all/genkan/src/eu/kanade/tachiyomi/extension/all/genkan/GenkanFactory.kt b/src/all/genkan/src/eu/kanade/tachiyomi/extension/all/genkan/GenkanFactory.kt
index dc5d0f74d..34db337a8 100644
--- a/src/all/genkan/src/eu/kanade/tachiyomi/extension/all/genkan/GenkanFactory.kt
+++ b/src/all/genkan/src/eu/kanade/tachiyomi/extension/all/genkan/GenkanFactory.kt
@@ -1,8 +1,10 @@
 package eu.kanade.tachiyomi.extension.all.genkan
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
 
+@MultiSource
 class GenkanFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         LeviatanScans(),
diff --git a/src/all/madara/src/eu/kanade/tachiyomi/extension/all/madara/MadaraFactory.kt b/src/all/madara/src/eu/kanade/tachiyomi/extension/all/madara/MadaraFactory.kt
index f9568f388..270a422b6 100644
--- a/src/all/madara/src/eu/kanade/tachiyomi/extension/all/madara/MadaraFactory.kt
+++ b/src/all/madara/src/eu/kanade/tachiyomi/extension/all/madara/MadaraFactory.kt
@@ -1,6 +1,7 @@
 package eu.kanade.tachiyomi.extension.all.madara
 
 import android.annotation.SuppressLint
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.lib.dataimage.DataImageInterceptor
 import eu.kanade.tachiyomi.lib.dataimage.dataImageAsUrl
 import eu.kanade.tachiyomi.network.GET
@@ -26,6 +27,7 @@ import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import rx.Observable
 
+@MultiSource
 class MadaraFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         AdonisFansub(),
diff --git a/src/all/mangabox/src/eu/kanade/tachiyomi/extension/all/mangabox/MangaBoxFactory.kt b/src/all/mangabox/src/eu/kanade/tachiyomi/extension/all/mangabox/MangaBoxFactory.kt
index c71bc6e89..a7200cf34 100644
--- a/src/all/mangabox/src/eu/kanade/tachiyomi/extension/all/mangabox/MangaBoxFactory.kt
+++ b/src/all/mangabox/src/eu/kanade/tachiyomi/extension/all/mangabox/MangaBoxFactory.kt
@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.extension.all.mangabox
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
@@ -14,6 +15,7 @@ import okhttp3.Request
 import okhttp3.Response
 import org.jsoup.nodes.Element
 
+@MultiSource
 class MangaBoxFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         Mangakakalot(),
diff --git a/src/all/mmrcms/src/eu/kanade/tachiyomi/extension/all/mmrcms/MyMangaReaderCMSSources.kt b/src/all/mmrcms/src/eu/kanade/tachiyomi/extension/all/mmrcms/MyMangaReaderCMSSources.kt
index 6ff654ed4..5919942f6 100644
--- a/src/all/mmrcms/src/eu/kanade/tachiyomi/extension/all/mmrcms/MyMangaReaderCMSSources.kt
+++ b/src/all/mmrcms/src/eu/kanade/tachiyomi/extension/all/mmrcms/MyMangaReaderCMSSources.kt
@@ -6,8 +6,10 @@ import com.github.salomonbrys.kotson.string
 import com.google.gson.JsonArray
 import com.google.gson.JsonObject
 import com.google.gson.JsonParser
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.source.SourceFactory
 
+@MultiSource
 class MyMangaReaderCMSSources : SourceFactory {
     /**
      * Create a new copy of the sources
diff --git a/src/all/paprika/src/eu/kanade/tachiyomi/extension/all/paprika/PaprikaFactory.kt b/src/all/paprika/src/eu/kanade/tachiyomi/extension/all/paprika/PaprikaFactory.kt
index f9d99a81e..c3c92134f 100644
--- a/src/all/paprika/src/eu/kanade/tachiyomi/extension/all/paprika/PaprikaFactory.kt
+++ b/src/all/paprika/src/eu/kanade/tachiyomi/extension/all/paprika/PaprikaFactory.kt
@@ -1,8 +1,10 @@
 package eu.kanade.tachiyomi.extension.all.paprika
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
 
+@MultiSource
 class PaprikaFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         MangazukiXyz(),
diff --git a/src/all/wpcomics/src/eu/kanade/tachiyomi/extension/all/wpcomics/WPComicsFactory.kt b/src/all/wpcomics/src/eu/kanade/tachiyomi/extension/all/wpcomics/WPComicsFactory.kt
index 87367dc33..2f9cb9ee0 100644
--- a/src/all/wpcomics/src/eu/kanade/tachiyomi/extension/all/wpcomics/WPComicsFactory.kt
+++ b/src/all/wpcomics/src/eu/kanade/tachiyomi/extension/all/wpcomics/WPComicsFactory.kt
@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.extension.all.wpcomics
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
@@ -17,6 +18,7 @@ import okhttp3.Response
 import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 
+@MultiSource
 class WPComicsFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         ManhuaPlus(),
diff --git a/src/all/wpmangastream/src/eu/kanade/tachiyomi/extension/all/wpmangastream/WPMangaStreamFactory.kt b/src/all/wpmangastream/src/eu/kanade/tachiyomi/extension/all/wpmangastream/WPMangaStreamFactory.kt
index 9d468bcb5..a52986a04 100644
--- a/src/all/wpmangastream/src/eu/kanade/tachiyomi/extension/all/wpmangastream/WPMangaStreamFactory.kt
+++ b/src/all/wpmangastream/src/eu/kanade/tachiyomi/extension/all/wpmangastream/WPMangaStreamFactory.kt
@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.extension.all.wpmangastream
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.asObservableSuccess
 import eu.kanade.tachiyomi.source.Source
@@ -21,6 +22,7 @@ import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import rx.Observable
 
+@MultiSource
 class WPMangaStreamFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         Kiryuu(),
diff --git a/src/all/zbulu/src/eu/kanade/tachiyomi/extension/all/zbulu/ZbuluFactory.kt b/src/all/zbulu/src/eu/kanade/tachiyomi/extension/all/zbulu/ZbuluFactory.kt
index c34517e4f..08dd51f71 100644
--- a/src/all/zbulu/src/eu/kanade/tachiyomi/extension/all/zbulu/ZbuluFactory.kt
+++ b/src/all/zbulu/src/eu/kanade/tachiyomi/extension/all/zbulu/ZbuluFactory.kt
@@ -1,8 +1,10 @@
 package eu.kanade.tachiyomi.extension.all.zbulu
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
 
+@MultiSource
 class ZbuluFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         HolyManga(),
diff --git a/src/en/mangareader/src/eu/kanade/tachiyomi/extension/en/mangareader/MRPFactory.kt b/src/en/mangareader/src/eu/kanade/tachiyomi/extension/en/mangareader/MRPFactory.kt
index 9b02685d9..5402044a9 100644
--- a/src/en/mangareader/src/eu/kanade/tachiyomi/extension/en/mangareader/MRPFactory.kt
+++ b/src/en/mangareader/src/eu/kanade/tachiyomi/extension/en/mangareader/MRPFactory.kt
@@ -1,8 +1,10 @@
 package eu.kanade.tachiyomi.extension.en.mangareader
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
 
+@MultiSource
 class MRPFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
             Mangareader(),
diff --git a/src/ja/mangaraw/src/eu/kanade/tachiyomi/extension/ja/mangaraw/MangaRawFactory.kt b/src/ja/mangaraw/src/eu/kanade/tachiyomi/extension/ja/mangaraw/MangaRawFactory.kt
index f9fa78cef..0bdd4e165 100644
--- a/src/ja/mangaraw/src/eu/kanade/tachiyomi/extension/ja/mangaraw/MangaRawFactory.kt
+++ b/src/ja/mangaraw/src/eu/kanade/tachiyomi/extension/ja/mangaraw/MangaRawFactory.kt
@@ -1,8 +1,10 @@
 package eu.kanade.tachiyomi.extension.ja.mangaraw
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
 
+@MultiSource
 class MangaRawFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         Manga1000(),
diff --git a/src/pt/mangasproject/src/eu/kanade/tachiyomi/extension/pt/mangasproject/MangasProjectFactory.kt b/src/pt/mangasproject/src/eu/kanade/tachiyomi/extension/pt/mangasproject/MangasProjectFactory.kt
index 846b83df3..b31f3db01 100644
--- a/src/pt/mangasproject/src/eu/kanade/tachiyomi/extension/pt/mangasproject/MangasProjectFactory.kt
+++ b/src/pt/mangasproject/src/eu/kanade/tachiyomi/extension/pt/mangasproject/MangasProjectFactory.kt
@@ -1,8 +1,10 @@
 package eu.kanade.tachiyomi.extension.pt.mangasproject
 
+import eu.kanade.tachiyomi.annotations.MultiSource
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceFactory
 
+@MultiSource
 class MangasProjectFactory : SourceFactory {
     override fun createSources(): List<Source> = listOf(
         LeitorNet(),