diff --git a/mkdocs.yml b/mkdocs.yml
index 3931d956144c8cbfddb60e776c84f74592717860..1dd593fee74296ee95a8d5bc2cd3853b4de80b3e 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -285,6 +285,7 @@ nav:                                      # Customizes the main navigation struc
             - Getting Started: documentation/analysis/cost_estimation/getting_started.md
             - Methods: documentation/analysis/cost_estimation/operating_cost_method.md
             - Run your First Estimation: documentation/analysis/cost_estimation/run_your_first_cost_estimation.md
+            - Software Architecture: documentation/analysis/cost_estimation/software_architecture.md
             # - API Reference: # TODO define for Python
           - Ecological Assessment:
             - Introduction: documentation/analysis/ecological_assessment/index.md