diff --git a/man2/nfsservctl.2 b/man2/nfsservctl.2
index 9834c8c2e..46309d925 100644
--- a/man2/nfsservctl.2
+++ b/man2/nfsservctl.2
@@ -28,8 +28,10 @@ Since Linux 3.1, this system call no longer exists.
 #define NFSCTL_DELCLIENT    2    /* Remove an NFS client. */
 #define NFSCTL_EXPORT       3    /* Export a file system. */
 #define NFSCTL_UNEXPORT     4    /* Unexport a file system. */
-#define NFSCTL_UGIDUPDATE   5    /* Update a client's UID/GID map. */
-#define NFSCTL_GETFH        6    /* Get a file handle (used by mountd). */
+#define NFSCTL_UGIDUPDATE   5    /* Update a client's UID/GID map 
+                                    (only in Linux 2.4.x and earlier). */
+#define NFSCTL_GETFH        6    /* Get a file handle (used by mountd) 
+                                    (only in Linux 2.4.x and earlier). */
 
 struct nfsctl_arg {
     int                       ca_version;     /* safeguard */