diff --git a/ndhc/config.h b/ndhc/config.h
index 5ea9e73..b0a8f79 100644
--- a/ndhc/config.h
+++ b/ndhc/config.h
@@ -1,5 +1,25 @@
-#ifndef DHCPC_H_
-#define DHCPC_H_
+/* config.h - internal configuration and state for ndhc
+ * Time-stamp: <2011-03-30 23:33:07 nk>
+ *
+ * (c) 2004-2011 Nicholas J. Kain <njkain at gmail dot com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef NDHC_CONFIG_H_
+#define NDHC_CONFIG_H_
 
 #include <stdint.h>
 
@@ -7,16 +27,16 @@
 #define RETRY_DELAY 30 /* time in seconds to delay after sending NUMPACKETS */
 
 enum {
-	DS_NULL = 0,
-	DS_INIT_SELECTING,
-	DS_REQUESTING,
-	DS_BOUND,
-	DS_RENEWING,
-	DS_REBINDING,
-	DS_ARP_GW_CHECK,
-	DS_ARP_CHECK,
-	DS_RENEW_REQUESTED,
-	DS_RELEASED
+    DS_NULL = 0,
+    DS_INIT_SELECTING,
+    DS_REQUESTING,
+    DS_BOUND,
+    DS_RENEWING,
+    DS_REBINDING,
+    DS_ARP_GW_CHECK,
+    DS_ARP_CHECK,
+    DS_RENEW_REQUESTED,
+    DS_RELEASED
 };
 
 enum {
@@ -26,40 +46,40 @@ enum {
 };
 
 enum {
-	IFS_NONE = 0,
-	IFS_UP,
-	IFS_DOWN,
-	IFS_SHUT,
-	IFS_REMOVED
+    IFS_NONE = 0,
+    IFS_UP,
+    IFS_DOWN,
+    IFS_SHUT,
+    IFS_REMOVED
 };
 
 struct client_state_t {
     unsigned long long leaseStartTime;
     int dhcpState;
     int arpPrevState;
-	int ifsPrevState;
+    int ifsPrevState;
     int listenMode;
     int packetNum;
     int epollFd, signalFd, listenFd, arpFd, nlFd;
     int timeout, oldTimeout;
     uint32_t requestedIP, serverAddr, routerAddr;
     uint32_t lease, t1, t2, xid;
-	unsigned char routerArp[6];
+    uint8_t routerArp[6];
 };
 
 struct client_config_t {
-	char foreground;		/* Do not fork */
-	char quit_after_lease;		/* Quit after obtaining lease */
-	char abort_if_no_lease;		/* Abort if no lease */
-	char background_if_no_lease;	/* Fork to background if no lease */
-	char *interface;		/* The name of the interface to use */
-	unsigned char *clientid;	/* Optional client id to use (unterminated) */
-	unsigned char *hostname;	/* Optional hostname to use (unterminated) */
-	int ifindex;			/* Index number of the interface to use */
-	unsigned char arp[6];		/* Our arp address */
+    char foreground;             /* Do not fork */
+    char quit_after_lease;       /* Quit after obtaining lease */
+    char abort_if_no_lease;      /* Abort if no lease */
+    char background_if_no_lease;    /* Fork to background if no lease */
+    char *interface;             /* The name of the interface to use */
+    uint8_t *clientid;           /* Optional client id to use (unterminated) */
+    uint8_t *hostname;           /* Optional hostname to use (unterminated) */
+    int ifindex;                 /* Index number of the interface to use */
+    uint8_t arp[6];              /* Our arp address */
 };
 
 extern struct client_config_t client_config;
 
-#endif
+#endif /* NDHC_CONFIG_H_ */