diff --git a/cellular_automata/game_of_life.py b/cellular_automata/game_of_life.py
index f2ce09440..8127c2bd2 100644
--- a/cellular_automata/game_of_life.py
+++ b/cellular_automata/game_of_life.py
@@ -60,7 +60,7 @@ def run(canvas):
 
     @returns:
     --
-    List
+    canvas of population after one step
     """
     canvas = np.array(canvas)
     next_gen_canvas = np.array(create_canvas(canvas.shape[0]))