diff --git a/man2/wait.2 b/man2/wait.2
index b6cb326c0..f452a5078 100644
--- a/man2/wait.2
+++ b/man2/wait.2
@@ -419,6 +419,11 @@ On failure, each of these calls sets
 to indicate the error.
 .SH ERRORS
 .TP
+.B EAGAIN
+The PID file descriptor specified in
+.I id
+is nonblocking and the process that it refers to has not terminated.
+.TP
 .B ECHILD
 (for
 .BR wait ())