diff --git a/docs/installation-development.md b/docs/installation-development.md
index 1e3634d21da1eee0e741ea2440ba2cd42cf405dd..f432dd31f67d16c128c6eac83fb27717f2432a2a 100644
--- a/docs/installation-development.md
+++ b/docs/installation-development.md
@@ -191,6 +191,13 @@ Use the convencience script `run.sh` to get engine started in different ways:
 
 **Run the Engine**
 
+If you have defined a virtual env during the installation step you'll ned to activate it whenever
+you gonna start the engine:
+
+```shell
+source python/bin/activate
+```
+
 This includes the Liquidsoap audio engine, but does not start the API server.
 
 ```shell