diff --git a/frappy_psi/lakeshore.py b/frappy_psi/lakeshore.py
index 31556a9..ab326d0 100644
--- a/frappy_psi/lakeshore.py
+++ b/frappy_psi/lakeshore.py
@@ -54,7 +54,7 @@ class Sensor340(LakeShore, Readable):
     channel = Property('lakeshore channel', StringType())
     # relay_mode = Property('relay setting mode', IntRange(0, 2))
     # relay = Property('relay high/low', IntRange(1, 2))
-    alarm = Parameter('alarm limits', FloatRange(unit='K'), readonly=False)
+    alarm = Parameter('alarm limit', FloatRange(unit='K'), readonly=False)
     # # define or alter the parameters
     # as Readable.value exists already, we give only the modified property 'unit'
     value = Parameter(unit='K')