diff --git a/gdb/config/arm/.Sanitize b/gdb/config/arm/.Sanitize
index c4a7fce51e..85af8c7258 100644
--- a/gdb/config/arm/.Sanitize
+++ b/gdb/config/arm/.Sanitize
@@ -1,4 +1,6 @@
-# Each directory to survive it's way into a release will need a file
+# .Sanitize for devo/gdb/config/arm.
+
+# Each directory to survive its way into a release will need a file
 # like this one called "./.Sanitize".  All keyword lines must exist,
 # and must exist in the order specified by this file.  Each directory
 # in the tree will be processed, top down, in the following order.
@@ -9,7 +11,7 @@
 
 # The lines between the "Do-first:" line and the "Things-to-keep:"
 # line are executed as a /bin/sh shell script before anything else is
-# done in this 
+# done in this directory.
 
 Do-first:
 
@@ -23,6 +25,7 @@ Things-to-keep:
 
 arm.mh
 arm.mt
+nm-arm.h
 tm-arm.h
 xm-arm.h