diff --git a/docs/source/guides/admin-guides/references/tools/detect_dhcpd.rst b/docs/source/guides/admin-guides/references/tools/detect_dhcpd.rst
index fa33e4a73..dbfa8fb43 100644
--- a/docs/source/guides/admin-guides/references/tools/detect_dhcpd.rst
+++ b/docs/source/guides/admin-guides/references/tools/detect_dhcpd.rst
@@ -6,12 +6,12 @@ detect_dhcpd
     Usage: detect_dhcpd -i interface [-m macaddress] [-t timeout] [-V]
 
     This command can be used to detect the dhcp server in a network for a specific mac address.
-    
+
     Options:
         -i interface:  The interface which facing the target network.
         -m macaddress: The mac that will be used to detect dhcp server. Recommend to use the real mac
-                       of the node that will be netboot. If no specified, the mac of interface which 
+                       of the node that will be netboot. If no specified, the mac of interface which
                        specified by -i will be used.
         -t timeout:    The time to wait to detect the dhcp messages. The default value is 10s.
-    
+
 Author:  Wang, Xiao Peng