diff --git a/etc/services.append b/etc/services.append
index 5f3352aca..9b66914f3 100644
--- a/etc/services.append
+++ b/etc/services.append
@@ -21,6 +21,7 @@ krb_prop	754/tcp		hprop		# Kerberos slave propagation
 kpop		1109/tcp			# Pop with Kerberos
 eklogin		2105/tcp			# Kerberos encrypted rlogin
 rkinit		2108/tcp			# Kerberos remote kinit
+kf		2110/tcp			# forward credentials
 kx		2111/tcp			# X over kerberos
 kip		2112/tcp			# IP over kerberos
 kauth		2120/tcp			# Remote kauth