diff --git a/addons.json b/addons.json
index b81b0c3..aee4962 100644
--- a/addons.json
+++ b/addons.json
@@ -43,7 +43,7 @@
     "name" : "DPS Meter",
     "file" : "dpsmeter",
     "extension" : "ipf",
-    "fileVersion" : "v1.3.0",
+    "fileVersion" : "v1.3.1",
     "releaseTag" : "dpsmeter",
     "unicode" : "📖",
     "description" : "DPS計測します。",
diff --git a/dpsmeter/README.md b/dpsmeter/README.md
index 884d68f..553ed53 100644
--- a/dpsmeter/README.md
+++ b/dpsmeter/README.md
@@ -1 +1,16 @@
+## Latest Release Note.
+
+### v1.3.1
+
+#### DPS計測ON/OFF追加
+
+初期状態をOFFとしました。
+
+チャットコマンドにてON/OFFを切り替えます。
+
+```lua
+/dpsm on  -- 計測開始
+/dpsm off -- 計測停止
+```
+
 see [http://www.weizlogy.gq/tos/addon/dpsmeter/](http://www.weizlogy.gq/tos/addon/dpsmeter/) 
\ No newline at end of file
diff --git a/dpsmeter/dpsmeter.lua b/dpsmeter/dpsmeter.lua
index f366aad..7e74bbf 100644
--- a/dpsmeter/dpsmeter.lua
+++ b/dpsmeter/dpsmeter.lua
@@ -93,12 +93,27 @@ function DPSMeter.new(self)
 end
 -- set call.
 setmetatable(DPSMeter, {__call = DPSMeter.new});
+
 -- frame initialize.
 function DPSMETER_ON_INIT(addon, frame)
+  DPSMeter.IsLock = 1;
   -- register handlers.
   addon:RegisterMsg('MAP_CHARACTER_UPDATE', 'DPSMETER_START');
   addon:RegisterMsg('FPS_UPDATE', 'DPSMETER_START');
+
+  if (DPSMeter.UI_CHAT == nil) then
+    DPSMeter.UI_CHAT = UI_CHAT;
+  end
+  UI_CHAT = function(msg)
+    if (msg == "/dpsm on") then
+      DPSMeter.IsLock = 0;
+    elseif (msg == "/dpsm off") then
+      DPSMeter.IsLock = 1;
+    end
+    DPSMeter.UI_CHAT(msg);
+  end
 end
+
 function DPSMETER_START(frame, msg, str, myhandle)
   if (DPSMeter.IsLock == 1) then
     return;