diff --git a/src/yunohost/service.py b/src/yunohost/service.py
index 91b060a57..20819ae98 100644
--- a/src/yunohost/service.py
+++ b/src/yunohost/service.py
@@ -573,6 +573,7 @@ def _give_lock(action, service, p):
     return son_PID
 
 def _remove_lock(PID_to_remove):
+    # FIXME ironically not concurrency safe because it's not atomic...
 
     PIDs = filesystem.read_file(MOULINETTE_LOCK).split("\n")
     PIDs_to_keep = [ PID for PID in PIDs if int(PID) != PID_to_remove ]