diff --git a/_data/links_en.yml b/_data/links_en.yml
index f6a8783..4c7c11c 100644
--- a/_data/links_en.yml
+++ b/_data/links_en.yml
@@ -38,7 +38,7 @@
   link:  chapters/environment.html
 
 - title: Active Block Modifiers
-  description: Learn how to make an ABM to change blocks.
+  description: Learn how to make ABMs to change blocks.
   num:   7
   link:  chapters/abms.html