diff --git a/uml.awk b/uml.awk
new file mode 100644
index 0000000..b5da64a
--- /dev/null
+++ b/uml.awk
@@ -0,0 +1,10 @@
+#!/usr/bin/gawk -f
+
+# Execute for every lines
+{
+   umlkey = "//u ";
+   pos = index($0, umlkey);
+   if (pos) {
+      print substr($0, pos + length(umlkey))
+   }
+}
diff --git a/uml.bat b/uml.bat
new file mode 100644
index 0000000..f877803
--- /dev/null
+++ b/uml.bat
@@ -0,0 +1,8 @@
+set path=%path%;C:\MinGW\msys\1.0\bin
+set PLANTUML=C:\Tools\plantuml\plantuml.jar
+
+if not exist doc mkdir doc
+gawk -f uml.awk ui.cpp > doc\ui.uml
+cd doc
+java -jar %PLANTUML% -charset UTF-8 -tsvg ui.uml
+cd ..