diff --git a/man2/setreuid.2 b/man2/setreuid.2
index 7d46dffa6..ffb01a220 100644
--- a/man2/setreuid.2
+++ b/man2/setreuid.2
@@ -97,6 +97,15 @@ On error, \-1 is returned, and
 is set appropriately.
 .SH ERRORS
 .TP
+.B EAGAIN
+.I ruid
+does not match the caller's real UID and this call would
+bring the number of processes belonging to the real user ID
+.I ruid
+over the caller's
+.B RLIMIT_NPROC
+resource limit.
+.TP
 .B EPERM
 The calling process is not privileged
 (Linux: does not have the