diff --git a/_config.yml b/_config.yml
index 7a66459..ddff7bc 100644
--- a/_config.yml
+++ b/_config.yml
@@ -243,14 +243,6 @@ imagemagick:
   output_formats:
     webp: "-quality 75%"
 
-# -----------------------------------------------------------------------------
-# Jekyll Diagrams
-# -----------------------------------------------------------------------------
-
-jekyll-diagrams:
-    # configuration, see https://github.com/zhustec/jekyll-diagrams.
-    # feel free to comment out this section if not using jekyll diagrams.
-
 
 # -----------------------------------------------------------------------------
 # Optional Features