diff --git a/Chapters/12-Transformers/INDEX.md b/Chapters/12-Transformers/INDEX.md
index 75bd064..0949663 100644
--- a/Chapters/12-Transformers/INDEX.md
+++ b/Chapters/12-Transformers/INDEX.md
@@ -88,7 +88,7 @@ $$
 \begin{aligned}
     Head_i = softmax\left(
         \frac{
-            Q_{i} \times K_{i}
+            Q_{i} \times K_{i}^T
         }{
             \sqrt{H}
         }