diff --git a/man2/shmop.2 b/man2/shmop.2
index 9fa92dae8..d37f44f6c 100644
--- a/man2/shmop.2
+++ b/man2/shmop.2
@@ -175,12 +175,17 @@ all attached shared memory segments are detached from the process.
 .SH "RETURN VALUE"
 On success
 .BR shmat ()
-returns the address of the attached shared memory segment, and
-.BR shmdt ()
-returns 0.
-On failure both functions return \-1 with
+returns the address of the attached shared memory segment; on error 
+.I (void *) \-1 
+is returned, and
 .I errno
-indicating the error.
+is set to indicate the cause of the error.
+
+On success
+.BR shmdt ()
+returns 0; on error \-1 is returned, and
+.I errno
+is set to indicate the cause of the error.
 .SH ERRORS
 When
 .BR shmat ()