diff --git a/tsmark/video_annotator.py b/tsmark/video_annotator.py
index fa1eaea..52e3059 100755
--- a/tsmark/video_annotator.py
+++ b/tsmark/video_annotator.py
@@ -792,6 +792,7 @@ class World:
     e         set width/height of box symmetric around center
     z c Home End  move between key-frames
     t         start optical flow tracker
+    m         start plugin (if defined)
        Color codes:
           green  keyframe
           purple interpolated frame