diff --git a/README.md b/README.md
index 621c495..62d234b 100644
--- a/README.md
+++ b/README.md
@@ -5,8 +5,17 @@ PHP stubs for the php cassandra extension.
 ## Requirements
 
 * PHP >= 5.3
-* Cassandra php druver https://github.com/datastax/php-driver
+* Cassandra php driver https://github.com/datastax/php-driver
 
+Cassandra php driver (https://github.com/datastax/php-driver) hasn't 
+appropriate version number. 
+The only version number available is for C/C++ driver 
+version (wich is not the version of the extension itself).
+Because of it, version of this library follow the cassandra 
+php-driver real version.
+
+If you need to use cassandra php-driver v1.2.2, please install our library at 1.2.2
+Follow the exact same logic for other available versions.
 
 ## Installing via Composer
 
@@ -21,7 +30,7 @@ Create the composer.json file as follows:
 ```json
 {
     "require-dev": {
-        "sachoo/cassandra-stubs": "~1.*"
+        "sachoo/cassandra-stubs": "1.3.0"
     }
 }
 ```