diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 085dcb16..ee0c0d4a 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -708,3 +708,6 @@ Antonio Ospite <ospite@studenti.unina.it>
 Karim Afifi <karim.afifi@free.fr>
  for reporting a problem with breaking off replay in case the user presses "Play"
  or "Pause" too soon after going into "Pause live video" mode
+
+Jon Burgess <mplayer@jburgess.uklinux.net>
+ for pointing out a problem with NPTL ("Native Posix Thread Library")
diff --git a/HISTORY b/HISTORY
index a88dc8d9..359bda32 100644
--- a/HISTORY
+++ b/HISTORY
@@ -2230,3 +2230,5 @@ Video Disk Recorder Revision History
 
 - Completed Greek language texts (thanks to Dimitrios Dimitrakos).
 - Completed Polish language texts (thanks to Michael Rakowski).
+- Added a note about NPTL ("Native Posix Thread Library") to the INSTALL file
+  (thanks to Jon Burgess for pointing this out).
diff --git a/INSTALL b/INSTALL
index cf66c5d3..2bae8e81 100644
--- a/INSTALL
+++ b/INSTALL
@@ -4,6 +4,16 @@ Installation of the Video Disk Recorder
 Version 1.2
 -----------
 
+IMPORTANT NOTE:
+---------------
+
+VDR currently doesn't work with NPTL ("Native Posix Thread Library").
+Either don't use NPTL, or set the environment variable
+
+  LD_ASSUME_KERNEL=2.4.1
+  
+before running VDR.
+
 Compiling and running the program:
 ----------------------------------