diff --git a/gas/ChangeLog b/gas/ChangeLog
index f0b70be4c43..fb08c90bb9e 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,7 @@
+2010-09-14  Jie Zhang  <jie@codesourcery.com>
+
+	* doc/c-arm.texi: Document -mcpu=cortex-m4.
+
 2010-09-09  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* config/tc-i386.c (build_vex_prefix): Check VEXW1 for 2-byte
diff --git a/gas/doc/c-arm.texi b/gas/doc/c-arm.texi
index 478ede31a23..f64b554359d 100644
--- a/gas/doc/c-arm.texi
+++ b/gas/doc/c-arm.texi
@@ -118,6 +118,7 @@ recognized:
 @code{cortex-a15},
 @code{cortex-r4},
 @code{cortex-r4f},
+@code{cortex-m4},
 @code{cortex-m3},
 @code{cortex-m1},
 @code{cortex-m0},