diff --git a/README.md b/README.md
index c12d7dd..17c2d7e 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,8 @@ where only the last few seconds are saved.
 
 ## Note
 This software works only on X11 (Wayland with Xwayland is NOT supported).\
-If you are using a variable refresh rate monitor then choose to record "screen-direct-force". This will allow variable refresh rate to work when recording fullscreen applications. Note that some applications such as mpv will not work in fullscreen mode. A fix is being developed for this.
+If you are using a variable refresh rate monitor then choose to record "screen-direct-force". This will allow variable refresh rate to work when recording fullscreen applications. Note that some applications such as mpv will not work in fullscreen mode. A fix is being developed for this.\
+GPU Screen Recorder only supports h264 and hevc codecs at the moment which means that webm files are not supported.
 ### TEMPORARY ISSUES
 1) screen-direct capture has been temporary disabled as it causes issues with stuttering. This might be a nvfbc bug.
 2) Recording the monitor on steam deck might fail sometimes. This happens even when using ffmpeg directly. This might be a steam deck driver bug. Recording a single window doesn't have this issue.
diff --git a/TODO b/TODO
index 775748e..76ff4b8 100644
--- a/TODO
+++ b/TODO
@@ -67,4 +67,4 @@ Support vp8/vp9/av1. This is especially important on amd which on some distros (
 Support screen (all monitors) capture on amd/intel when no combined plane is found.
 Use separate plane (which has offset and pitch) from combined plane instead of the combined plane.
 
-Different streaming sites have limits on bitrate, resolution, etc. For twitch, this is a good place to look: https://help.twitch.tv/s/article/broadcasting-guidelines?language=en_US. For youtube, the information is available here: https://support.google.com/youtube/answer/2853702?hl=en#zippy=%2Cvariable-bitrate-with-custom-stream-keys-in-live-control-room%2Ck-p-fps%2Cp-fps (youtube supports variable bitrate).
\ No newline at end of file
+Both twitch and youtube support variable bitrate but twitch recommends constant bitrate to reduce stream buffering/dropped frames when going from low motion to high motion: https://help.twitch.tv/s/article/broadcasting-guidelines?language=en_US. Info for youtube: https://support.google.com/youtube/answer/2853702?hl=en#zippy=%2Cvariable-bitrate-with-custom-stream-keys-in-live-control-room%2Ck-p-fps%2Cp-fps.
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 9515d8d..5da59ab 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -651,6 +651,8 @@ static void usage_full() {
     fprintf(stderr, "\n");
     fprintf(stderr, "  -c    Container format for output file, for example mp4, or flv. Only required if no output file is specified or if recording in replay buffer mode.\n");
     fprintf(stderr, "        If an output file is specified and -c is not used then the container format is determined from the output filename extension.\n");
+    fprintf(stderr, "        Only containers that support h264 or hevc are supported, which means that only mp4, mkv, flv (and some others) are supported.\n");
+    fprintf(stderr, "        WebM is not supported yet.\n");
     fprintf(stderr, "\n");
     fprintf(stderr, "  -s    The size (area) to record at in the format WxH, for example 1920x1080. This option is only supported (and required) when -w is \"focused\".\n");
     fprintf(stderr, "\n");