diff --git a/mkdocs.yml b/mkdocs.yml
index e6bbe340..2f229d00 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -70,6 +70,8 @@ nav:
         - Large class: code_smells/large_class.md
         - Long method: code_smells/long_method.md
         - Feature envy: code_smells/feature_envy.md
+    - Metrics:
+        - Testability prediction: metrics/testability.md
     - Optimization:
         - Search-based refactoring: optimization/search-based_refactoring.md
     - Tutorials: