diff --git a/README.md b/README.md
index 9430797..3f236ac 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ which this shell script provides.
 
 # `h264_v4l2m2m` Special Treatment
 
-Here are the quirks I've identified
+Here are the `h264_v4l2m2m` quirks I've identified
 (February 2023):
 
 * The codec will not write into a `.mkv` container,
@@ -23,6 +23,8 @@ Here are the quirks I've identified
   making it look like you don't have enough capture buffers.
   You will never have enough capture buffers:
   you have to stop trying to copy over subtitles.
+* `-crf` value, if set, is ignored:
+  you must use `-b:v`.
 
 The solution this script uses is to
 transcode video and audio