diff --git a/doc/kerberos4.texi b/doc/kerberos4.texi
index 3a5ab97b1..47f21fa80 100644
--- a/doc/kerberos4.texi
+++ b/doc/kerberos4.texi
@@ -202,7 +202,7 @@ contains a minimalistic Rx implementation.
 There are three parts of the kaserver; KAA (Authentication), KAT (Ticket
 Granting), and KAM (Maintenance). The KAA interface and KAT interface
 both passes over DES encrypted data-blobs (just like the
-Kerberos-protocol) and thus o not need any other protection.  The KAM
+Kerberos-protocol) and thus do not need any other protection.  The KAM
 interface uses @code{rxkad} (Kerberos authentication layer for Rx) for
 security and data protection, and is used for example for changing
 passwords.  This part is not implemented in the kdc.