diff --git a/docs/core_concept/index.rst b/docs/core_concept/index.rst
index 2916e2024..c075354bc 100644
--- a/docs/core_concept/index.rst
+++ b/docs/core_concept/index.rst
@@ -5,4 +5,4 @@ Math Foundation
    :maxdepth: 1
 
    brainpy_transform_concept
-   brainpy_transform_concept
+   brainpy_dynamical_system