diff --git a/HISTORY b/HISTORY
index e712e37d..ad4d470c 100644
--- a/HISTORY
+++ b/HISTORY
@@ -4600,3 +4600,6 @@ Video Disk Recorder Revision History
   changes to timer parameters before the actual recording starts (inspired by
   Christian Wieninger's "epgsearch" plugin).
 - Added format check to syslog_with_tid().
+- Updated the INSTALL file's section about non-VDR files in the video directory
+  (since version 1.3.38 disk access is done in a separate thread, so the watchdog
+  timer won't hit).
diff --git a/INSTALL b/INSTALL
index a12989c8..d4ac230d 100644
--- a/INSTALL
+++ b/INSTALL
@@ -320,7 +320,7 @@ with the name of the basic directory when running 'vdr':
    vdr -v /video0
 
 Note that you should not copy any non-VDR files into the /videoX directories,
-since this might cause the watchdog timer to expire when VDR cleans up those
+since this might cause a lot of unnecessary disk access when VDR cleans up those
 directories and there is a large number of files and/or subdirectories in
 there.