diff --git a/cogl/cogl-onscreen.h b/cogl/cogl-onscreen.h
index 02218297c..17778b76c 100644
--- a/cogl/cogl-onscreen.h
+++ b/cogl/cogl-onscreen.h
@@ -52,7 +52,7 @@ typedef struct _CoglOnscreen CoglOnscreen;
  * configured before later being allocated, either implicitly when
  * it is first used or explicitly via cogl_framebuffer_allocate().
  *
- * Return value: A newly instantiated #CoglOnscreen framebuffer
+ * Return value: (transfer full): A newly instantiated #CoglOnscreen framebuffer
  * Since: 1.8
  * Stability: unstable
  */