diff --git a/mkdocs.yml b/mkdocs.yml
index f1c8c54a007a3b21939ec955c08a430eb8d5d2aa..fa27c6836ad9bd16f30c5060c8c7ce3f9dcbb452 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -36,8 +36,7 @@ nav:
     - Debye model: '2_debye_model_solutions.md'
     - Drude model: '3_drude_model_solutions.md'
     - Sommerfeld model: '4_sommerfeld_model_solutions.md'
-    # - Sommerfeld model: '4_sommerfeld_model_solutions.md'
-    # - LCAO model: '5_atoms_and_lcao_solutions.md'
+    - LCAO model: '5_atoms_and_lcao_solutions.md'
     # - Bonds and spectra: '6_bonds_and_spectra_solutions.md'
     # - Tight-binding model: '7_tight_binding_solutions.md'
     # - Many atoms per unit cell: '8_many_atoms_solutions.md'