diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 20f04d2af..69c059411 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -428,7 +428,7 @@ In short: The easier the code review is, the better the chance your pull request
     parseYesNoBoolAttribute();
     ```
 
-11. Check if there is already defined global variable, and reuse it instead of defining new one.
+11. Check if there are already defined global variables, and reuse them instead of defining new ones.
 
 12. Avoid "Yoda conditions".