diff --git a/fs/lockd/clntxdr.c b/fs/lockd/clntxdr.c
index a3e97278b997..6ea3448d2d31 100644
--- a/fs/lockd/clntxdr.c
+++ b/fs/lockd/clntxdr.c
@@ -2,8 +2,9 @@
 /*
  * linux/fs/lockd/clntxdr.c
  *
- * XDR functions to encode/decode NLM version 3 RPC arguments and results.
- * NLM version 3 is backwards compatible with NLM versions 1 and 2.
+ * XDR functions to encode/decode NLM version 1 and 3 RPC
+ * arguments and results. NLM version 2 is not specified
+ * by a standard, thus it is not implemented.
  *
  * NLM client-side only.
  *