diff --git a/trellism4_extended.py b/trellism4_extended.py
index 017c3c1..af0beb9 100644
--- a/trellism4_extended.py
+++ b/trellism4_extended.py
@@ -289,13 +289,13 @@ class NeoTrellisM4:
 
     def activate_key(self, key, edge, enable=True):
         """
-        Activate or deactivate a key on the trellis.
+        Activate or deactivate a key on the trellis
 
         :param int key : key number from 0 to 16.
         :param int edge : specifies what edge to register an event on and can be
-        NeoTrellis.EDGE_FALLING or NeoTrellis.EDGE_RISING.
+           NeoTrellis.EDGE_FALLING or NeoTrellis.EDGE_RISING.
         :param bool enable : should be set to True if the event is to be enabled,
-        or False if the event is to be disabled.
+           or False if the event is to be disabled.
         """
         self.set_event(key, edge, enable)