diff --git a/ChangeLog b/ChangeLog
index df3ebf0da8..8adbef3bf0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2002-07-03  Jean-Marc Lasgouttes  <lasgouttes@freesurf.fr>
+
+	* INSTALL: document --enable-debug
+
 2002-07-01  Kayvan A. Sylvan  <kayvan@sylvan.com>
 
 	* configure.in (LYX_USE_FRONTEND): Change order of libraries for
diff --git a/INSTALL b/INSTALL
index eef62e211f..e79f8701d8 100644
--- a/INSTALL
+++ b/INSTALL
@@ -155,6 +155,11 @@ flags:
     optimization of LyX. The compile may be much quicker with some
     compilers, but LyX will run more slowly. 
  
+  o --enable-debug will add debug information to your binary. This
+    requires a lot more disk space, but is a must if you want to try to
+    debug problems in LyX. The default is to have debug information
+    for development versions and prereleases only.
+
 There are also flags to control the internationalization support in
 LyX: