diff --git a/README.md b/README.md
index f7475c9..9230e8b 100755
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ base datastructure in OpenCV. Things like images are just matrices of pixels.
 
 #### Creation
 
-        new Matrix(cols, rows)
+        new Matrix(rows, cols)
 
 Or if you're thinking of a Matrix as an image:
 
diff --git a/src/Matrix.cc b/src/Matrix.cc
index 01f1527..d7b2ca1 100755
--- a/src/Matrix.cc
+++ b/src/Matrix.cc
@@ -105,8 +105,8 @@ Matrix::Matrix(): ObjectWrap() {
 }
 
 
-Matrix::Matrix(int cols, int rows): ObjectWrap() {
-    mat = cv::Mat(cols, rows, CV_32FC3);
+Matrix::Matrix(int rows, int cols): ObjectWrap() {
+    mat = cv::Mat(rows, cols, CV_32FC3);
 }
 
 Matrix::Matrix(cv::Mat m, cv::Rect roi): ObjectWrap() {