diff --git a/pyaedt/modules/Boundary.py b/pyaedt/modules/Boundary.py
index c1ca986c87b..10f63c8eae1 100644
--- a/pyaedt/modules/Boundary.py
+++ b/pyaedt/modules/Boundary.py
@@ -4699,7 +4699,7 @@ class SquareWaveDictionary(BoundaryDictionary):
     on_value : str
         Maximum value of the square wave.
     initial_time_off : str
-        Time after which the square wave assignment starts
+        Time after which the square wave assignment starts.
     on_time : str
         Time for which the square wave keeps the maximum value during one period.
     off_time : str