diff --git a/xCAT-server/xCAT-wsapi/genrestapidoc.pm b/xCAT-server/xCAT-wsapi/genrestapidoc.pm
index 9dec9ba81..f0344818c 100755
--- a/xCAT-server/xCAT-wsapi/genrestapidoc.pm
+++ b/xCAT-server/xCAT-wsapi/genrestapidoc.pm
@@ -243,8 +243,13 @@ sub outwiki {
                 } else {
                     print "\n    #curl -X $parts[2] -k \'https://127.0.0.1/xcatws$parts[3]$postfix\'\n";
                 }
-                $parts[4] =~ s/\n/\n    /g;
-                print "    $parts[4]\n\n---\n";
+
+                if ($parts[4]) {
+                    $parts[4] =~ s/\n/\n    /g;
+                    print "    $parts[4]\n\n---\n";
+                } else {
+                    print "\n---\n";
+                }
             } else {
                 push @errmsg, "Error format for:[".$def->{desc}."]\n";
             }
@@ -371,6 +376,7 @@ sub gendoc {
     }
 
     if ($format eq "wiki") {
+        print "![](http://sourceforge.net/p/xcat/wiki/XCAT_Documentation/attachment/Official-xcat-doc.png)\n\n";
         print "\n[TOC]\n";
     }
 
diff --git a/xCAT-server/xCAT-wsapi/xcatws.cgi b/xCAT-server/xCAT-wsapi/xcatws.cgi
index c3318bf7e..32f681834 100755
--- a/xCAT-server/xCAT-wsapi/xcatws.cgi
+++ b/xCAT-server/xCAT-wsapi/xcatws.cgi
@@ -807,7 +807,7 @@ my %URIdef = (
             POST => {
                 desc => "Create the osimage resources base on the parameters specified in the Data body.",
                 #usage => "|$usagemsg{objchparam} DataBody: {iso:isoname\\file:filename\\node:noderange,params:[{attr1:value1,attr2:value2}]}|$usagemsg{non_getreturn}|",
-                usage => "|$usagemsg{objchparam} DataBody: {iso:isoname\\file:filename,params:[{attr1:value1,attr2:value2}]}|$usagemsg{non_getreturn}|",
+                usage => "|$usagemsg{objchparam} DataBody: {iso:isopath,file:filename,params:[{attr1:value1,attr2:value2}]}|$usagemsg{non_getreturn}|",
                 example1 => "|Create osimage resources based on the ISO specified|POST|/osimages {\"iso\":\"/iso/RHEL6.4-20130130.0-Server-ppc64-DVD1.iso\"}||",
                 example2 => "|Create osimage resources based on an xCAT image or configuration file|POST|/osimages {\"file\":\"/tmp/sles11.2-x86_64-install-compute.tgz\"}||",
                 # TD: the imgcapture need to be moved to nodes/.*/osimages
@@ -883,7 +883,7 @@ my %URIdef = (
             matcher => '^\/osimages\/[^\/]*/instance$',
             POST => {
                 desc => "Operate the instance of the osimage {imgname}.",
-                usage => "|$usagemsg{objchparam} DataBody: {action:gen\\pack\\export,params:[{attr1:value1,attr2:value2...}]}|$usagemsg{non_getreturn}|",
+                usage => "|$usagemsg{objchparam} DataBody: {action:gen OR pack OR export,params:[{attr1:value1,attr2:value2...}]}|$usagemsg{non_getreturn}|",
                 example1 => "|Generates a stateless image based on the specified osimage|POST|/osimages/sles11.2-x86_64-install-compute/instance {\"action\":\"gen\"}||",
                 example2 => "|Packs the stateless image from the chroot file system based on the specified osimage|POST|/osimages/sles11.2-x86_64-install-compute/instance {\"action\":\"pack\"}||",
                 example3 => "|Exports an xCAT image based on the specified osimage|POST|/osimages/sles11.2-x86_64-install-compute/instance {\"action\":\"export\"}||",