diff --git a/lectures/python_by_example.md b/lectures/python_by_example.md
index 9967a1c2..ba5c962f 100644
--- a/lectures/python_by_example.md
+++ b/lectures/python_by_example.md
@@ -498,7 +498,7 @@ x_0 = 0
 \quad \text{and} \quad t = 0,\ldots,T
 $$
 
-Use $T=200$, $\alpha = 0.9$ and $\{\epsilon_t\}$ as before.
+Use $T=200$, $\alpha = 0.9 \,$ and $\{\epsilon_t\}$ as before.
 
 Search online for a function that can be used to compute the absolute value $|x_t|$.