diff --git a/sys/ximage/ximagesink.c b/sys/ximage/ximagesink.c
index d68ec68c6d..41d7df061f 100644
--- a/sys/ximage/ximagesink.c
+++ b/sys/ximage/ximagesink.c
@@ -2403,8 +2403,9 @@ gst_ximagesink_class_init (GstXImageSinkClass * klass)
       g_param_spec_string ("display", "Display", "X Display name",
           NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
   g_object_class_install_property (gobject_class, PROP_SYNCHRONOUS,
-      g_param_spec_boolean ("synchronous", "Synchronous", "When enabled, runs "
-          "the X display in synchronous mode. (used only for debugging)", FALSE,
+      g_param_spec_boolean ("synchronous", "Synchronous",
+          "When enabled, runs the X display in synchronous mode. "
+          "(unrelated to A/V sync, used only for debugging)", FALSE,
           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
   g_object_class_install_property (gobject_class, PROP_FORCE_ASPECT_RATIO,
       g_param_spec_boolean ("force-aspect-ratio", "Force aspect ratio",
diff --git a/sys/xvimage/xvimagesink.c b/sys/xvimage/xvimagesink.c
index ba10ef0717..03e4d30ad8 100644
--- a/sys/xvimage/xvimagesink.c
+++ b/sys/xvimage/xvimagesink.c
@@ -3575,8 +3575,8 @@ gst_xvimagesink_class_init (GstXvImageSinkClass * klass)
           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
   g_object_class_install_property (gobject_class, PROP_SYNCHRONOUS,
       g_param_spec_boolean ("synchronous", "Synchronous",
-          "When enabled, runs "
-          "the X display in synchronous mode. (used only for debugging)", FALSE,
+          "When enabled, runs the X display in synchronous mode. "
+          "(unrelated to A/V sync, used only for debugging)", FALSE,
           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
   g_object_class_install_property (gobject_class, PROP_PIXEL_ASPECT_RATIO,
       g_param_spec_string ("pixel-aspect-ratio", "Pixel Aspect Ratio",