diff --git a/docs/reference/groups.yml b/docs/reference/groups.yml
index f957051cd..0be0fd5c3 100644
--- a/docs/reference/groups.yml
+++ b/docs/reference/groups.yml
@@ -111,7 +111,7 @@
     # Example
     ```example
     $ [a, b/2] $
-    $ lr(]sum_(x=1)^n] x, size: #50%) $
+    $ lr(]sum_(x=1)^n], size: #50%) x $
     $ abs((x + y) / 2) $
     ```