diff --git a/src/modules/visibility.md b/src/modules/visibility.md
index ae22ae75..4ad31046 100644
--- a/src/modules/visibility.md
+++ b/src/modules/visibility.md
@@ -1,6 +1,6 @@
 # Visibility
 
-Module are a privacy boundary:
+Modules are a privacy boundary:
 
 * Module items are private by default (hides implementation details).
 * Parent and sibling items are always visible.