diff --git a/mkdocs.yml b/mkdocs.yml
index 5a7d0497d1ac989a5abe3752e0c9a3971790cf9b..f19be0fe037b837f903398de8d653b0fe211be16 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -12,8 +12,7 @@ nav:
   - Tutorial 1 Basic local phenotype: tutorials/example1.md
   - Tutorial 2 More complex local phenotype: tutorials/example2.md
   - Tutorial 3 Using a remote git repository: tutorials/example3.md
-  - API Reference:
-      - acmc: api/acmc.html  
+  - API Reference: api/acmc.html  
   - Change Log: changelog.md
   - Troubleshooting: troubleshooting.md