diff --git a/src/dynamic_graph/signal_base.py b/src/dynamic_graph/signal_base.py
index 56e49c43ed31a2a1010132142507774cac6abb78..5ce2920ac29a16f6bf0eccca2ccd7a2addf81583 100644
--- a/src/dynamic_graph/signal_base.py
+++ b/src/dynamic_graph/signal_base.py
@@ -8,7 +8,7 @@ import re
 
 def stringToTuple(vector):
     """
-    Transform a string of format '[n](x_1, x_2, ..., x_{n-1} into a list of
+    Transform a string of format '[n](x_1, x_2, ..., x_{n-1}) into a list of
     numbers
     """
     # Find vector length