diff --git a/run_pm_dmo_NFW_fixed_timestep.md b/run_pm_dmo_NFW_fixed_timestep.md
index 0a069f7ab2c9940bd74b018131e665a72edff53b..9365f0b18846a18fc534face311e1146645260c1 100644
--- a/run_pm_dmo_NFW_fixed_timestep.md
+++ b/run_pm_dmo_NFW_fixed_timestep.md
@@ -8,7 +8,7 @@ Here is a first benefit of a modular code: since in `hotwheels `PM is a self-con
 Install the PM module (will install core,IO, and timestep as dependencies):
 
 ```bash
-pip install 'git+ssh://git@git.ia2.inaf.it/hotwheels/PM.git@v0.0.0alpha'
+pip install 'howtheels_PM[tested] @ git+ssh://git@git.ia2.inaf.it/hotwheels/PM.git@v0.0.0alpha'
 ```
 
 And you can run this code: