* @param [in] client Client principal
* @param [in] arg_keytab Key table handle
* @param [in] start_time Time when ticket becomes valid (0 for now)
- * @param [in] in_tkt_service Service name of initial credentials (or NLUL)
+ * @param [in] in_tkt_service Service name of initial credentials (or NULL)
* @param [in] k5_gic_options Initial credential options
*
* This function requests KDC for an initial credentials for @a client using a