diff --git a/gst-libs/gst/pbutils/descriptions.c b/gst-libs/gst/pbutils/descriptions.c
index 61c3f037b2..751236b3c0 100644
--- a/gst-libs/gst/pbutils/descriptions.c
+++ b/gst-libs/gst/pbutils/descriptions.c
@@ -193,6 +193,7 @@ static const FormatInfo formats[] = {
   {"video/x-vp5", "On2 VP5", 0},
   {"video/x-vp6", "On2 VP6", 0},
   {"video/x-vp6-flash", "On2 VP6/Flash", 0},
+  {"video/x-vp6-alpha", "On2 VP6 with alpha", 0},
   {"video/x-vp7", "On2 VP7", 0},
   {"video/x-vp8", "VP8", 0},
   {"video/x-xvid", "XVID MPEG-4", 0},
@@ -224,6 +225,7 @@ static const FormatInfo formats[] = {
   {"image/x-tga", "TGA", 0},
 
   /* subtitle formats with static descriptions */
+  {"application/x-ass", "ASS", 0},
   {"application/x-subtitle-sami", N_("Sami subtitle format"), 0},
   {"application/x-subtitle-tmplayer", N_("TMPlayer subtitle format"), 0},
   {"application/x-kate", "Kate", 0},