diff --git a/man2/mlock.2 b/man2/mlock.2
index 0968ca910..b8487ff29 100644
--- a/man2/mlock.2
+++ b/man2/mlock.2
@@ -114,7 +114,7 @@ signal to the process.
 unlocks all pages mapped into the address space of the
 calling process.
 .SH RETURN VALUE
-On success these system calls return 0.
+On success, these system calls return 0.
 On error, \-1 is returned,
 .I errno
 is set appropriately, and no changes are made to any locks in the