diff --git a/soitool/modules/module_base.py b/soitool/modules/module_base.py
index abe735a2dfa18623f5062fcacdc3bdc1581fe0e6..c9f6a266e6fac6759bac07577b3768b3007a08c6 100644
--- a/soitool/modules/module_base.py
+++ b/soitool/modules/module_base.py
@@ -173,7 +173,7 @@ def event_is_ctrl_minus(event):
     Returns
     -------
     bool
-        True if is event is 'CTRL -'
+        True if event is 'CTRL -'.
     """
     # Underline is in practice minus in this situation. We don't know why
     return (
@@ -193,7 +193,7 @@ def event_is_shift_plus(event):
     Returns
     -------
     bool
-        True if is event is 'SHIFT +'
+        True if event is 'SHIFT +'.
     """
     return event.key() == Qt.Key_Question
 
@@ -209,7 +209,7 @@ def event_is_shift_minus(event):
     Returns
     -------
     bool
-        True if is event is 'SHIFT -'
+        True if event is 'SHIFT -'.
     """
     # Underline is in practice minus in this situation. We don't know why
     return (