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 e6b0fed..5e4de4e 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
@@ -32,9 +32,14 @@ abstract class HttpSource : CatalogueSource {
     open val versionId: Int = throw Exception("Stub!")
 
     /**
-     * Id of the source. By default it uses a generated id using the first 16 characters (64 bits)
-     * of the MD5 of the string: sourcename/language/versionId
-     * Note the generated id sets the sign bit to 0.
+     * ID of the source. By default it uses a generated id using the first 16 characters (64 bits)
+     * of the MD5 of the string `"${name.lowercase()}/$lang/$versionId"`.
+     *
+     * The ID is generated by the [generateId] function, which can be reused if needed
+     * to generate outdated IDs for cases where the source name or language needs to
+     * be changed but migrations can be avoided.
+     *
+     * Note: the generated ID sets the sign bit to `0`.
      */
     override val id: Long = throw Exception("Stub!")
 
@@ -48,6 +53,26 @@ abstract class HttpSource : CatalogueSource {
      */
     open val client: OkHttpClient = throw Exception("Stub!")
 
+    /**
+     * Generates a unique ID for the source based on the provided [name], [lang] and
+     * [versionId]. It will use the first 16 characters (64 bits) of the MD5 of the string
+     * `"${name.lowercase()}/$lang/$versionId"`.
+     *
+     * Note: the generated ID sets the sign bit to `0`.
+     *
+     * Can be used to generate outdated IDs, such as when the source name or language
+     * needs to be changed but migrations can be avoided.
+     *
+     * @since extensions-lib 1.5
+     * @param name [String] the name of the source
+     * @param lang [String] the language of the source
+     * @param versionId [Int] the version ID of the source
+     * @return a unique ID for the source
+     */
+    protected fun generateId(name: String, lang: String, versionId: Int): Long {
+        throw Exception("Stub!")
+    }
+
     /**
      * Headers builder for requests. Implementations can override this method for custom headers.
      */