diff --git a/subjects/matrix/README.md b/subjects/matrix/README.md
index 303bc903..953308a2 100644
--- a/subjects/matrix/README.md
+++ b/subjects/matrix/README.md
@@ -54,6 +54,6 @@ And its output:
 $ cargo run
 Matrix([[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]])
 Matrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]])
-Matrix([[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]])
+Matrix([[0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0]])
 $
 ```