diff --git a/mkdocs.yml b/mkdocs.yml
index 4e7f7ee353a4e29a2df28ca5c1c09e5f7b8eb79f..6158c208ab7b2c0f016fc9baff885aeb3a5bb83a 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -34,6 +34,7 @@ nav:
   - Solutions:
     - Einstein model: '1_einstein_model_solutions.md'
     - Debye model: '2_debye_model_solutions.md'
+    - Tight-binding model: '7_Tight-binding_model_sol.md'
 
 theme:
   name: material
diff --git a/src/solutions/7_Tight-binding_model.md b/src/solutions/7_Tight-binding_model_sol.md
similarity index 100%
rename from src/solutions/7_Tight-binding_model.md
rename to src/solutions/7_Tight-binding_model_sol.md