diff --git a/CODING_STANDARD.md b/CODING_STANDARD.md
index c5d67173e14..972a59ffd24 100644
--- a/CODING_STANDARD.md
+++ b/CODING_STANDARD.md
@@ -154,6 +154,7 @@ Formatting is enforced using clang-format. For more information about this, see
 - Make member functions `const` whenever possible
 - Do not hide base class functions
 - You are encouraged to use `override`
+- When using `override` also use `virtual`
 - Single argument constructors must be `explicit`
 - Avoid implicit conversions
 - Avoid `friend` declarations