diff --git a/Documentation/NuttShell.html b/Documentation/NuttShell.html
index ee752faa73..3317150bbc 100644
--- a/Documentation/NuttShell.html
+++ b/Documentation/NuttShell.html
@@ -1169,7 +1169,7 @@ arp [-a <ipaddr> |-d <ipaddr> |-s <ipaddr> <hwaddr>]
 </p>
 <ul><pre>
 nsh&gt; arp -a 10.0.0.1
-nsh: arp: ioctl failed: 22
+nsh: arp: no such ARP entry: 10.0.0.1
 
 nsh&gt; arp -s 10.0.0.1 00:13:3b:12:73:e6
 nsh&gt; arp -a 10.0.0.1
@@ -1177,7 +1177,7 @@ HWAddr: 00:13:3b:12:73:e6
 
 nsh&gt; arp -d 10.0.0.1
 nsh&gt; arp -a 10.0.0.1
-nsh: arp: ioctl failed: 22
+nsh: arp: no such ARP entry: 10.0.0.1
 </pre></ul>
 
 <table width ="100%">