diff --git a/man3/rcmd.3 b/man3/rcmd.3
index 57f1d6f68..5c099c390 100644
--- a/man3/rcmd.3
+++ b/man3/rcmd.3
@@ -45,7 +45,7 @@
 .Nm ruserok
 .Nd routines for returning a stream to a remote command
 .Sh SYNOPSIS
-.Fd #include <unistd.h>
+.Fd #include <netdb.h> \ \ \fP/* Or <unistd.h> on some systems */
 .Ft int
 .Fn rcmd "char **ahost" "int inport" "const char *locuser" "const char *remuser" "const char *cmd" "int *fd2p"
 .Ft int