diff --git a/libraries/transformer/src/main/java/androidx/media3/transformer/EditedMediaItem.java b/libraries/transformer/src/main/java/androidx/media3/transformer/EditedMediaItem.java
index f14aa44536..f9f46bc886 100644
--- a/libraries/transformer/src/main/java/androidx/media3/transformer/EditedMediaItem.java
+++ b/libraries/transformer/src/main/java/androidx/media3/transformer/EditedMediaItem.java
@@ -103,6 +103,9 @@ public final class EditedMediaItem {
      * {@link Mp4Extractor} used. Otherwise, the slow motion metadata will be ignored and the input
      * won't be flattened.
      *
+     * <p>Slow motion flattening is only supported when the {@link Composition} contains one {@link
+     * MediaItem}.
+     *
      * <p>Using slow motion flattening together with {@link MediaItem.ClippingConfiguration} is not
      * supported yet.
      *