diff --git a/man2/msgctl.2 b/man2/msgctl.2
index e092fcb86..ea39e1099 100644
--- a/man2/msgctl.2
+++ b/man2/msgctl.2
@@ -311,6 +311,17 @@ of the message queue,
 and the process is not privileged (Linux: it does not have the
 .B CAP_SYS_ADMIN
 capability).
+.TP
+.B EPERM
+An attempt
+.RB ( IPC_SET )
+was made to increase
+.I msg_qbytes
+beyond the system parameter
+.BR MSGMNB ,
+but the caller is not privileged (Linux: does not have the
+.B CAP_SYS_RESOURCE
+capability).
 .SH CONFORMING TO
 SVr4, POSIX.1-2001.
 .\" SVID does not document the EIDRM error condition.