diff --git a/libnetutils/dhcp_utils.c b/libnetutils/dhcp_utils.c
old mode 100755
new mode 100644
index 1e08eb6..d18931b
--- a/libnetutils/dhcp_utils.c
+++ b/libnetutils/dhcp_utils.c
@@ -145,6 +145,11 @@
 /*
  * Start the dhcp client daemon, and wait for it to finish
  * configuring the interface.
+ *
+ * The device init.rc file needs a corresponding entry for this work.
+ *
+ * Example:
+ * service dhcpcd_<interface> /system/bin/dhcpcd -ABKL
  */
 int dhcp_do_request(const char *interface,
                     char *ipaddr,
@@ -287,8 +292,11 @@
 }
 
 /**
- * Run WiMAX dhcp renew service.
- * "wimax_renew" service shoud be included in init.rc.
+ * The device init.rc file needs a corresponding entry.
+ *
+ * Example:
+ * service iprenew_<interface> /system/bin/dhcpcd -n
+ *
  */
 int dhcp_do_request_renew(const char *interface,
                     in_addr_t *ipaddr,