diff --git a/packages/Python/README.md b/packages/Python/README.md
index a6b2a7e..c3ecbd8 100644
--- a/packages/Python/README.md
+++ b/packages/Python/README.md
@@ -56,9 +56,20 @@ invR = mr.RotInv(R)
 You should get the variable `invR` whose value is the same as the output 
 shown in the function usage example.
 
+Your complete first test code that will return invR could be as follows:
+```
+import modern_robotics as mr
+import numpy as np
+R = np.array([[0, 0, 1],
+              [1, 0, 0],
+              [0, 1, 0]])
+invR = mr.RotInv(R)
+print invR
+```
+
 ## Using the Package Locally ##
 
 It is possible to use the package locally without installation. Download and
 place the package in the working directory. Note that since the package is 
 not installed, you need to move the package if the working directory is
-changed. Importing is still required before using.
\ No newline at end of file
+changed. Importing is still required before using.