diff --git a/mkdocs.yml b/mkdocs.yml
index 0092059b833d92e33bee04d21f381151819a2046..0d665d0d93d2bd51cbb8d4e6ac7399ff2ff0246f 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -35,6 +35,7 @@ nav:
     - Einstein model: '1_einstein_model_solutions.md'
     - Debye model: '2_debye_model_solutions.md'
     - Tight-binding model: '7_tight_binding_model_sol.md'
+    - Many atoms per unit cell: '8_many_atoms_sol.md'
 
 theme:
   name: material