diff --git a/gtk/gtkimcontextsimple.c b/gtk/gtkimcontextsimple.c
index a04224e14c..987e2b0f58 100644
--- a/gtk/gtkimcontextsimple.c
+++ b/gtk/gtkimcontextsimple.c
@@ -1453,6 +1453,8 @@ gtk_im_context_simple_add_table (GtkIMContextSimple *context_simple,
  * @compose_file: The path of compose file
  *
  * Adds an additional table from the X11 compose file.
+ *
+ * Since: 3.20
  */
 void
 gtk_im_context_simple_add_compose_file (GtkIMContextSimple *context_simple,