Document EINVAL

diff --git a/lib/libc/sys/wait.2 b/lib/libc/sys/wait.2
index 8be94ed..d72a93d 100644 (file)
--- a/lib/libc/sys/wait.2
+++ b/lib/libc/sys/wait.2
@@ -271,6 +271,10 @@ The call was interrupted by a caught signal,
 or the signal did not have the
 .Dv SA_RESTART
 flag set.
+.It Bq Er EINVAL
+Invalid or underfined flags were passed in the
+.Fa options
+argument.
 .El
 .Sh STANDARDS
 The