diff --git a/README.md b/README.md
index 8212cb4..33328b9 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,17 @@ This method is used to create a barcode image from a value.
 Accepts a matrix type (see exported `MATRIX_*` constants) and a value and returns a data URI string,
 representing an SVG of the barcode marker.
 
+Supported matrix types (values start from 0):
+
+| Matrix type       | Max value   |
+| ----------------- | ----------- |
+| `3x3_hamming_6_3` |           7 |
+| `3x3_parity_6_5`  |          31 |
+| `4x4_bch_13_5_5`  |          31 |
+| `4x4_bch_13_9_3`  |         511 |
+| `5x5_bch_22_7_7`  |         128 |
+| `5x5_bch_22_12_5` |        4095 |
+
 **MarkerModule.getMarkerPattern(dataURI)**
 
 This method is used to create a `.patt` file from an image.
@@ -75,7 +86,7 @@ a data URI string representing the final marker image.
 const { MarkerModule, MATRIX_3X3_HAMMING_63 } = ARjsStudioBackend;
 
 // generate an SVG data URI for the value '8'
-const barcodeMarkerSVG = MarkerModule.getBarcodeMarkerSVGDataURI(MATRIX_3X3_HAMMING_63, 8);
+const barcodeMarkerSVG = MarkerModule.getBarcodeMarkerSVGDataURI(MATRIX_3X3_HAMMING_63, 7);
 
 const barcodeImage = new Image();
 barcodeImage.src = barcodeMarkerSVG; // use the image 'load' event to know when image is ready
@@ -83,11 +94,15 @@ barcodeImage.src = barcodeMarkerSVG; // use the image 'load' event to know when
 // ----
 
 // draw the image on an off-screen canvas and use `.toDataURL()` to get a data URI
-const fullMarker = MarkerModule.getFullMarkerImage(imageDataURI, 1.0, 100, 'black');
-const pattFile = MarkerModule.getMarkerPattern(imageDataURI);
+const fullMarker = await MarkerModule.getFullMarkerImage(imageDataURI, 1.0, 100, 'black');
+const pattFile = await MarkerModule.getMarkerPattern(imageDataURI);
 
 const patternImage = new Image();
-patternImage.src = fullMarker; // use the image 'load' event to know when image is ready
+patternImage.src = fullMarker;
+// use the image 'load' event to know when image is ready
+patternImage.addEventListener('load', () => {
+    document.body.appendChild(patternImage);
+})
 
 const pattFileDownload = document.createElement('a');
 pattFileDownload.href = `data:text/plain;charset=utf-8,${pattFile}`;