diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 4a57c235..85c2fd1d 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -541,6 +541,7 @@ Tomas Prybil <tomas.prybil@copper.se>
 
 Matthias Fechner <matthiasfechner@web.de>
  for pointing out a bug in parsing 'E' records in epg2html.pl
+ for suggesting to add a note about LANG having to be set to a valid locale in INSTALL
 
 Paul Lacatus <paul@campina.iiruc.ro>
  for translating OSD texts to the Romanian language
diff --git a/HISTORY b/HISTORY
index 622ba156..45037d50 100644
--- a/HISTORY
+++ b/HISTORY
@@ -5388,3 +5388,5 @@ Video Disk Recorder Revision History
 - Fixed stripping the context in I18nTranslate() (reported by Christian
   Wieninger).
 - Fixed detecting whether a particular locale is actually supported.
+- Added a note about LANG having to be set to a valid locale in INSTALL
+  (suggested by Matthias Fechner).
diff --git a/INSTALL b/INSTALL
index cbef729b..a26e43bb 100644
--- a/INSTALL
+++ b/INSTALL
@@ -113,6 +113,9 @@ in the log file, it is sufficient to just set
 which only influences the way strings are sorted and leaves error messages
 in English.
 
+Note that for VDR's internationalized texts to work, the LANG environment
+variable must be set to a valid locale!
+
 Automatic restart in case of hangups:
 -------------------------------------