diff --git a/docs/api.md b/docs/api.md
index 0c41086..cb997c9 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -39,4 +39,10 @@
     options:
         members:
             - calculate_compound_interest
+        show_root_toc_entry: False
+
+::: dinero.tools.calculate_markup
+    options:
+        members:
+            - calculate_markup
         show_root_toc_entry: False
\ No newline at end of file