diff --git a/mkdocs.yml b/mkdocs.yml
index 09bcd2f03bde7e44f627f433e58d39f5402eee3f..50536c825b6bd34955b1253965876e4df96213f8 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -7,6 +7,7 @@ site_description: |
 nav:
   - Intro: 'index.md'
   - Coordinates: 'coordinates.md'
+  - Differential equations 1: 'differential_equations_1.md'
   
 theme:
   name: material