diff --git a/docs/index.rst b/docs/index.rst
index 91c514f..33441a3 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -39,7 +39,7 @@ Document Structure
 
 .. toctree::
    :maxdepth: 3
-   :caption: CONCEPTS:
+   :caption: COMPONENTS:
 
    Market <components/market.rst>
    Learnware & Reuser <components/learnware.rst>