diff --git a/library/src/main/java/eu/kanade/tachiyomi/source/CatalogueSource.kt b/library/src/main/java/eu/kanade/tachiyomi/source/CatalogueSource.kt
index fbb17fc..fb04675 100644
--- a/library/src/main/java/eu/kanade/tachiyomi/source/CatalogueSource.kt
+++ b/library/src/main/java/eu/kanade/tachiyomi/source/CatalogueSource.kt
@@ -10,6 +10,7 @@ interface CatalogueSource : Source {
     /**
      * An ISO 639-1 compliant language code (two letters in lower case).
      */
+    @Deprecated("Use language instead", ReplaceWith("language"))
     val lang: String
 
     /**
@@ -43,5 +44,6 @@ interface CatalogueSource : Source {
     /**
      * Returns the list of filters for the source.
      */
+    @Deprecated("Use the new suspend variant instead", ReplaceWith("getSearchFilters"))
     fun getFilterList(): FilterList
-}
\ No newline at end of file
+}
diff --git a/library/src/main/java/eu/kanade/tachiyomi/source/Source.kt b/library/src/main/java/eu/kanade/tachiyomi/source/Source.kt
index 83f9af4..7fd5baa 100644
--- a/library/src/main/java/eu/kanade/tachiyomi/source/Source.kt
+++ b/library/src/main/java/eu/kanade/tachiyomi/source/Source.kt
@@ -1,5 +1,7 @@
 package eu.kanade.tachiyomi.source
 
+import eu.kanade.tachiyomi.source.model.FilterList
+import eu.kanade.tachiyomi.source.model.MangasPage
 import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
@@ -21,6 +23,50 @@ interface Source {
      */
     val name: String
 
+    /**
+     * Represents an IETF BCP 47 compliant language tag.
+     * Special cases include:
+     * - [Language.MULTI]: Indicates multiple languages.
+     * - [Language.OTHER]: Refers to a language not explicitly defined.
+     * - 'all': Indicates multiple language.
+     *
+     * Usage of 'all' is highly discouraged and is only supported due to legacy reasons.
+     *
+     * @since extensions-lib 1.5
+     */
+    val language: String
+
+    /**
+     * Indicates if the source supports search filters
+     */
+    val hasSearchFilters: Boolean
+
+    /**
+     * Returns the list of filters for the source.
+     *
+     * @since extensions-lib 1.5
+     */
+    suspend fun getSearchFilters(): FilterList
+
+    /**
+     * Get a page with a list of manga.
+     *
+     * @since extensions-lib 1.5
+     * @param query the search query.
+     * @param filters the list of filters to apply.
+     * @param page the page number to retrieve.
+     */
+    suspend fun getMangaList(query: String, filters: FilterList, page: Int): MangasPage = throw Exception("Stub!")
+
+    /**
+     * Get the updated details for a manga and its chapters
+     *
+     * @since extensions-lib 1.5
+     * @param manga manga to get details and chapters for
+     * @return the updated manga and its chapters
+     */
+    suspend fun getMangaDetailsAndChapters(manga: SManga): Pair<SManga, List<SChapter>> = throw Exception("Stub!")
+
     /**
      * Get the updated details for a manga.
      *
@@ -66,4 +112,9 @@ interface Source {
         ReplaceWith("getPageList"),
     )
     fun fetchPageList(chapter: SChapter): Observable<List<Page>> = throw Exception("Stub!")
-}
\ No newline at end of file
+
+    object Language {
+        const val MULTI = "multi"
+        const val OTHER = "other"
+    }
+}
diff --git a/library/src/main/java/eu/kanade/tachiyomi/source/online/HttpSource.kt b/library/src/main/java/eu/kanade/tachiyomi/source/online/HttpSource.kt
index f1d2c26..fbae961 100644
--- a/library/src/main/java/eu/kanade/tachiyomi/source/online/HttpSource.kt
+++ b/library/src/main/java/eu/kanade/tachiyomi/source/online/HttpSource.kt
@@ -15,6 +15,12 @@ import rx.Observable
 @Suppress("unused", "unused_parameter")
 abstract class HttpSource : CatalogueSource {
 
+    @Suppress("DEPRECATION")
+    override val language: String get() = lang
+
+    @Suppress("DEPRECATION")
+    override val hasSearchFilters: Boolean get() = getFilterList().isNotEmpty()
+
     /**
      * Network service.
      */
@@ -48,6 +54,11 @@ abstract class HttpSource : CatalogueSource {
      */
     open val client: OkHttpClient = throw Exception("Stub!")
 
+    override suspend fun getSearchFilters(): FilterList {
+        @Suppress("DEPRECATION")
+        return getFilterList()
+    }
+
     /**
      * Headers builder for requests. Implementations can override this method for custom headers.
      */
@@ -328,6 +339,10 @@ abstract class HttpSource : CatalogueSource {
     /**
      * Returns the list of filters for the source.
      */
+    @Deprecated(
+        "Use the new suspend variant instead",
+        replaceWith = ReplaceWith("getSearchFilters")
+    )
     override fun getFilterList(): FilterList {
         throw Exception("Stub!")
     }