diff --git a/[refs] b/[refs]
index 40d63bdaf04b..950647a123df 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a4a787187bcf94b1bf4deb74cbe30eb442519875
+refs/heads/master: d7493e518fa98d2c30c545c518df075903bae513
diff --git a/trunk/Documentation/video4linux/cx2341x/README.hm12 b/trunk/Documentation/video4linux/cx2341x/README.hm12
index 0e213ed095e6..b36148ea0750 100644
--- a/trunk/Documentation/video4linux/cx2341x/README.hm12
+++ b/trunk/Documentation/video4linux/cx2341x/README.hm12
@@ -32,6 +32,10 @@ Y, U and V planes. This code assumes frames of 720x576 (PAL) pixels.
 The width of a frame is always 720 pixels, regardless of the actual specified
 width.
 
+If the height is not a multiple of 32 lines, then the captured video is
+missing macroblocks at the end and is unusable. So the height must be a
+multiple of 32.
+
 --------------------------------------------------------------------------
 
 #include <stdio.h>