add command for retrieving the code example

README.md

diff --git a/README.md b/README.md
index 904003c..0815ea7 100644
--- a/README.md
+++ b/README.md
@@ -10,15 +10,19 @@
     library](https://dl.google.com/mapsbooking/apiclients/v1alpha/mapsbooking_java_public.zip)
     , unzip the file to get the 'mapsbooking' package.
 
-2.  Create a java project in your IDE, download the sample codes
-    (InventoryUpdate.java & BookingNotification.java), import them into your
-    java project under src directory.
+2.  Create a java project in your IDE, retrieve the sample codes
+    (InventoryUpdate.java & BookingNotification.java) from this repo:
+
+        git clone https://maps-booking.googlesource.com/java-maps-booking-api-example
+
+    import them into your java project under src directory.
 
 3.  Make a copy of your private key (JSON file) to the src directory.
 
-4.  Add the Java Client Library to the dependencies of your project
+4.  Add the Java Client Library to the dependencies of your project (include jar
+    files under mapsbooking and libs-sources directory).
 
-5.  In both java files, follow the TODOs to complete your implementations
+5.  In both java files, follow the TODOs to complete your implementations.
 
 More detail about the REST API can be found
 [here.](https://developers.google.com/maps-booking/reference/maps-booking-api/rest/)