diff --git a/src/11_nearly_free_electron_model_solutions.md b/src/11_nearly_free_electron_model_solutions.md
index 78dae1493148ffe9bbdeebbda6ed008b1b1fb136..eb5e77536fbf29b88a9cfef627bd7c6661b6772e 100644
--- a/src/11_nearly_free_electron_model_solutions.md
+++ b/src/11_nearly_free_electron_model_solutions.md
@@ -1,4 +1,4 @@
-``python tags=["initialize"]
+```python tags=["initialize"]
 from matplotlib import pyplot as plt 
 import numpy as np
 from math import pi