diff --git a/README.rst b/README.rst
index 5b9a93d..4513315 100644
--- a/README.rst
+++ b/README.rst
@@ -26,7 +26,11 @@ Usage of DAI module
 There is a executable DAI module. User can invoke it via the command line
 interface.::
 
-    python -m iottalkpy.dai /path/to/your/ida
+    python -m iottalkpy.dai /path/to/your/ida.py
+
+or::
+
+    python -m iottalkpy.dai /path/to/your/ida  # in case of dir
 
 
 Usage of DAN module
diff --git a/iottalkpy/__init__.py b/iottalkpy/__init__.py
index d4b750f..6c3c2c9 100644
--- a/iottalkpy/__init__.py
+++ b/iottalkpy/__init__.py
@@ -1 +1 @@
-version = '2.2.0'
+version = '2.2.1'