diff --git a/README.md b/README.md
index 34cd715..2378025 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ Below are the methods supported in this library.
 |---|---|
 |open|Open the IP2Proxy BIN data for lookup.|
 |close|Close and reset metadata.|
-|package_version|Get the package version (1 to 10 for PX1 to PX10 respectively).|
+|package_version|Get the package version (1 to 11 for PX1 to PX11 respectively).|
 |module_version|Get the module version.|
 |database_version|Get the database version.|
 |is_proxy|Check whether if an IP address was a proxy. Returned value:<ul><li>-1 : errors</li><li>0 : not a proxy</li><li>1 : a proxy</li><li>2 : a data center IP address or search engine robot</li></ul>|