diff --git a/README.org b/README.org
index 1d475a4..7d6140a 100644
--- a/README.org
+++ b/README.org
@@ -76,7 +76,7 @@ Arrays are **first-class values**:
 
 #+BEGIN_SRC zrl
 real[3] pos = [1.0, 2.0, 3.0];
-real[4][4] mat = identity();
+real[3][3] mat = identity(3);
 real[3] result = mat * pos;  ! compiler generates matrix-vector multiply
 #+END_SRC