diff --git a/man2/setresuid.2 b/man2/setresuid.2
index 5d64415b0..49cf0f5a1 100644
--- a/man2/setresuid.2
+++ b/man2/setresuid.2
@@ -69,6 +69,13 @@ is set appropriately.
 .SH ERRORS
 .TP
 .B EAGAIN
+The call would change the caller's real UID (i.e.,
+.I ruid
+does not match the caller's real UID),
+but there was a temporary failure allocating the
+necessary kernel data structures.
+.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