diff --git a/src/argparser.cpp b/src/argparser.cpp
index b971212..7c22d7f 100644
--- a/src/argparser.cpp
+++ b/src/argparser.cpp
@@ -219,7 +219,11 @@ bool ArgParser::parse()
                 m_pkgmkArgs += " " + s;
             } else if ( s == "-um" ) {
                 m_pkgmkArgs += " " + s;
-            } else if ( s == "-kw" ) {
+            } else if ( s == "-is" ) {
+		m_pkgmkArgs += " " + s;
+            } else if ( s == "-us" ) {
+		m_pkgmkArgs += " " + s;
+	    } else if ( s == "-kw" ) {
                 m_pkgmkArgs += " " + s;
             } else if ( s == "-ns" ) {
                 m_pkgmkArgs += " " + s;
diff --git a/src/prtget.cpp b/src/prtget.cpp
index 3d9863f..8a790bc 100644
--- a/src/prtget.cpp
+++ b/src/prtget.cpp
@@ -180,6 +180,8 @@ void PrtGet::printUsage()
     cout << "                -if                 ignore footprint" << endl;
     cout << "                -um                 update md5sum" << endl;
     cout << "                -im                 ignore md5sum" << endl;
+    cout << "                -us                 update signature" << endl;
+    cout << "                -is                 ignore signature" << endl;
     cout << "                --margs=<string>    pass 'string' to pkgmk"
          << endl;
     cout << "                --aargs=<string>    pass 'string' to pkgadd"