diff --git a/README.md b/README.md
index d0d0c9f..93f5e94 100755
--- a/README.md
+++ b/README.md
@@ -138,7 +138,7 @@ var mat = new cv.Matrix.Eye(4,4); // Create identity matrix
 mat.get(0,0) // 1
 
 mat.row(0)  // [1,0,0,0]
-mat.col(4)  // [0,0,0,1]
+mat.col(3)  // [0,0,0,1]
 ```
 
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