diff --git a/frappy_psi/qnw.py b/frappy_psi/qnw.py
index f699352..2f4ee32 100644
--- a/frappy_psi/qnw.py
+++ b/frappy_psi/qnw.py
@@ -141,5 +141,6 @@ class TemperatureLoopTC1(SensorTC1, Drivable):
         return value
 
     def stop(self):
+        """stop at current value (does nothing if ramp is not used)"""
         if self.control and self.ramp_used:
             self.write_target(self.value)
diff --git a/frappy_psi/uniax.py b/frappy_psi/uniax.py
index 067b058..c46db3b 100644
--- a/frappy_psi/uniax.py
+++ b/frappy_psi/uniax.py
@@ -411,6 +411,7 @@ class Uniax(PersistentMixin, Drivable):
 
     @Command()
     def stop(self):
+        """stop motor and control"""
         if self.motor.isBusy():
             self.log.info('stop motor')
             self.motor_stop()