diff --git a/src/main/java/info/istlab/IoTP/Launcher.java b/src/main/java/info/istlab/IoTP/Launcher.java
index 0ff2047..056a7a4 100644
--- a/src/main/java/info/istlab/IoTP/Launcher.java
+++ b/src/main/java/info/istlab/IoTP/Launcher.java
@@ -123,7 +123,7 @@
         menuBar.add(menu);
 
         mi = new JMenuItem(isEnglish ? "Usage" : "つかいかた");
-        mi.addActionListener(ae -> openURL("https://ss.istlab.info/presens/dview/383/"));
+        mi.addActionListener(ae -> openURL("https://ss.istlab.info/presens/dview/395/"));
         menu.add(mi);
 
         setJMenuBar(menuBar);