diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e24affb6836..e5e2b8e8a4c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -2,7 +2,8 @@
 
 	* doc/extend.texi (X86 Built-in Functions): Add whitespace in
 	__builtin_ia32_paddb256 and __builtin_ia32_pavgb256
-	documentation.
+	documentation.  Add missing '__' in front of
+	__builtin_ia32_packssdw256.
 
 2013-01-11  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
 
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 06a0a1595a5..8ce6e1edd1b 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -10430,7 +10430,7 @@ v32qi __builtin_ia32_mpsadbw256 (v32qi,v32qi,v32qi,int)
 v32qi __builtin_ia32_pabsb256 (v32qi)
 v16hi __builtin_ia32_pabsw256 (v16hi)
 v8si __builtin_ia32_pabsd256 (v8si)
-v16hi builtin_ia32_packssdw256 (v8si,v8si)
+v16hi __builtin_ia32_packssdw256 (v8si,v8si)
 v32qi __builtin_ia32_packsswb256 (v16hi,v16hi)
 v16hi __builtin_ia32_packusdw256 (v8si,v8si)
 v32qi __builtin_ia32_packuswb256 (v16hi,v16hi)