diff --git a/mkdocs.yml b/mkdocs.yml
index a9aae406b198aee420098797d0768ce8a55c2342..c2c736b21677d6b25401f0980d1e2bb872463e06 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -5,9 +5,9 @@ edit_uri: edit/master/src/
 site_description: |
   Lecture notes for the TU Delft course TN3105 - Mathematics for Quantum Physics
 nav:
-  - Intro: 'index.md'
-  - Complex Numbers: '1_complex_numbers.md'
-  - Coordinates: '2_coordinates.md'
+  - Introduction: 'index.md'
+  - Complex numbers: '1_complex_numbers.md'
+  - Coordinate systems: '2_coordinates.md'
   - Vector spaces: '3_vector_spaces.md'
   - Vector spaces in quantum mechanics: '4_vector_spaces_QM.md'
   - Operators in quantum mechanics: '5_operators_QM.md'