diff --git a/examples/python/zebra_sat.py b/examples/python/zebra_sat.py
index 71f6880389..18cc89af0b 100644
--- a/examples/python/zebra_sat.py
+++ b/examples/python/zebra_sat.py
@@ -39,6 +39,8 @@ from ortools.sat.python import cp_model
 
 # pylint: disable=too-many-statements
 def solve_zebra():
+    """Solves the zebra problem."""
+
     # Create the model.
     model = cp_model.CpModel()