diff --git a/winsup/doc/ChangeLog b/winsup/doc/ChangeLog
index 2f0cf26a6..ed656afc2 100644
--- a/winsup/doc/ChangeLog
+++ b/winsup/doc/ChangeLog
@@ -1,3 +1,8 @@
+2010-01-10  Corinna Vinschen  <corinna@vinschen.de>
+
+	* pathnames.sgml (mount-table): Add info that posix=0 is default for
+	the cygdrive prefix.
+
 2010-01-07  Corinna Vinschen  <corinna@vinschen.de>
 
 	* overview.sgml: Fix Red Hat brand name.
diff --git a/winsup/doc/pathnames.sgml b/winsup/doc/pathnames.sgml
index f6aa84fcd..4cca824f5 100644
--- a/winsup/doc/pathnames.sgml
+++ b/winsup/doc/pathnames.sgml
@@ -88,9 +88,10 @@ posix=[0|1].  The meaning of the options is as follows.</para>
   notexec   - Treat all files below mount point as not executable.
   nouser    - Mount is a system-wide mount.
   override  - Force the override of an immutable mount point (currently "/").
-  posix=0   - Switch off case sensitivity for paths under this mount point.
+  posix=0   - Switch off case sensitivity for paths under this mount point
+	      (default for the cygdrive prefix).
   posix=1   - Switch on case sensitivity for paths under this mount point
-	      (default).
+	      (default for all other mount points).
   text      - Files default to CRLF text mode line endings.
   user      - Mount is a user mount.
 </screen>