Repair URL for pip install in doc/index.md

diff --git a/doc/index.md b/doc/index.md
index 0a7977116687846352f7f93a0b125dd8899bacfd..e3f6bca750f61a5f27bb880b166a025511df2c4f 100644 (file)
--- a/doc/index.md
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@@ -7,7 +7,7 @@ It works with Python 2 as well as Python 3.
 
 The Python Graph API can be installed with `pip` directly from our git repository:
 ```sh
-$ pip install git://git.graph-it.com/graphit/graph-client-py.git
+$ pip install git+git://git.graph-it.com/graphit/graph-client-py.git
 ```
 
 The Graph API uses [msgpack](https://msgpack.org/).