diff --git a/gst/gstbus.c b/gst/gstbus.c
index fbe24643f6..9936290231 100644
--- a/gst/gstbus.c
+++ b/gst/gstbus.c
@@ -911,6 +911,8 @@ gst_bus_add_watch_full_unlocked (GstBus * bus, gint priority,
  * There can only be a single bus watch per bus, you must remove it before you
  * can set a new one.
  *
+ * The bus watch will only work if a GLib main loop is being run.
+ *
  * When @func is called, the message belongs to the caller; if you want to
  * keep a copy of it, call gst_message_ref() before leaving @func.
  *
@@ -953,6 +955,8 @@ gst_bus_add_watch_full (GstBus * bus, gint priority,
  * There can only be a single bus watch per bus, you must remove it before you
  * can set a new one.
  *
+ * The bus watch will only work if a GLib main loop is being run.
+ *
  * The watch can be removed using gst_bus_remove_watch() or by returning %FALSE
  * from @func. If the watch was added to the default main context it is also
  * possible to remove the watch using g_source_remove().