diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 142044f2c..fabc6f718 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,7 @@
+2010-01-15  Corinna Vinschen  <corinna@vinschen.de>
+
+	* posix.sgml: Mention dup3 and pipe2 as GNU extensions.
+
 2010-01-14  Corinna Vinschen  <corinna@vinschen.de>
 
 	* dcrt0.cc (dll_crt0_1): Reset locale to "C" at the last moment before
diff --git a/winsup/cygwin/posix.sgml b/winsup/cygwin/posix.sgml
index 8c88417da..b68d4bad8 100644
--- a/winsup/cygwin/posix.sgml
+++ b/winsup/cygwin/posix.sgml
@@ -1009,6 +1009,7 @@ also IEEE Std 1003.1-2008 (POSIX.1-2008).</para>
     asprintf_r
     canonicalize_file_name
     dremf
+    dup3
     envz_add
     envz_entry
     envz_get
@@ -1040,6 +1041,7 @@ also IEEE Std 1003.1-2008 (POSIX.1-2008).</para>
     lsetxattr
     memmem
     mempcpy
+    pipe2
     pow10
     pow10f
     removexattr