diff --git a/README.md b/README.md
index ba5a264..674835a 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ ffmpeg -i %s -s 1080x720 %s
Select video or audio file from your file explorer, and click the button.
When it finishes probing, the result of metadata will display on screen.
-### Joining the group to learn FFmpeg:
+### Joining the group to learn FFmpeg(1群已满):

### Preview thumbnail when seeking:
diff --git a/picture/ffmpeg_group.png b/picture/ffmpeg_group.png
index 58e5ba6..a492d8c 100644
Binary files a/picture/ffmpeg_group.png and b/picture/ffmpeg_group.png differ