diff --git a/lib/krb5/krb5_principal.3 b/lib/krb5/krb5_principal.3
index 64bfba47d..6ee981bc9 100644
--- a/lib/krb5/krb5_principal.3
+++ b/lib/krb5/krb5_principal.3
@@ -181,6 +181,8 @@ argument the following flags can be passed in
 no realm if the realm is one of the local realms.
 .It Dv KRB5_PRINCIPAL_UNPARSE_NO_REALM
 never include any realm in the principal name.
+.It Dv KRB5_PRINCIPAL_UNPARSE_DISPLAY
+don't quote
 .El
 On failure
 .Fa name