diff --git a/docs/source/usage/layout.rst b/docs/source/usage/layout.rst
index 8475aba..fd35159 100644
--- a/docs/source/usage/layout.rst
+++ b/docs/source/usage/layout.rst
@@ -32,11 +32,10 @@ Trigger type menu has eight items. Also > icon can open Trigger type menu.
     "Full screen", "BURAI windows size are changed full screen."
     "Quit [Ctr +Q]", "BURAI platform are finished."
 
+
 * Materials API
 
-BURAI can get crystal structure by using `Materials API <https://materialsproject.org/>`_ .
-Therefore, users have to enter element symbols into the bar of Materials API.
-The detailed explanation is shown in Materials API content (add link).
+
 
 Home tab
 --------