diff --git a/README.md b/README.md
index 878e4ae..77aee62 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,43 @@
 # matches-subimage
-Lightweight library that finds matches of an image within another image
+
+Lightweight library that finds matches of an image within another image, perfect for visual validation in testing scenarios.
+Heavily inspired by (read: blatantly copied some subroutines from) [pixelmatch](https://github.com/mapbox/pixelmatch), and just like [pixelmatch](https://github.com/mapbox/pixelmatch), its advantages are that it's fast and lightweight, with zero dependencies.
+
+Usage demo:
+```js
+const foundMatch = subImageMatch(img, subImg);
+```
+
+## API
+
+### pixelmatch(img, subImg[, options])
+
+- `img1`, `img2` — Image data of the images to compare (`Buffer`, `Uint8Array` or `Uint8ClampedArray`).
+- `options` is an object literal with only one property currently:
+    - `threshold` — Matching threshold, ranges from `0` to `1`. Smaller values make the comparison more sensitive. `0.1` by default.
+
+Returns a boolean indicating whether or not a match has been found
+
+## Example usage
+
+### Node.js
+
+```js
+const fs = require("fs");
+const PNG = require("pngjs").PNG;
+const subImageMatch = require("subimage-match");
+
+const img = PNG.sync.read(fs.readFileSync("image.png"));
+const subImg = PNG.sync.read(fs.readFileSync("sub_image.png"));
+subImageMatch(img1.data, img2.data, {threshold: 0.1});
+```
+
+## Install
+
+Install with NPM:
+
+```bash
+npm install pixelmatch
+```
+
+## [Changelog](https://github.com/dieterwalckiers/subimage-match/releases)
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index 7b7a871..0000000
--- a/package-lock.json
+++ /dev/null
@@ -1,1169 +0,0 @@
-{
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-  "version": "1.0.0",
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-      "dev": true,
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-      "dev": true,
-      "requires": {
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-      }
-    }
-  }
-}
diff --git a/package.json b/package.json
index e5b10fb..e2d6303 100644
--- a/package.json
+++ b/package.json
@@ -1,38 +1,36 @@
 {
-  "name": "matches-subimage",
-  "version": "1.0.0",
-  "description": "Lightweight library that finds matches of an image within another image",
-  "main": "index.js",
-  "scripts": {
-    "lint": "eslint",
-    "test": "node test/test.js"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/dieterwalckiers/matches-subimage.git"
-  },
-  "keywords": [
-    "image",
-    "pixels",
-    "comparison",
-    "match",
-    "matches",
-    "subimage",
-    "within",
-    "image",
-    "inside"
-  ],
-  "author": "Dieter Walckiers",
-  "license": "MIT",
-  "bugs": {
-    "url": "https://github.com/dieterwalckiers/matches-subimage/issues"
-  },
-  "homepage": "https://github.com/dieterwalckiers/matches-subimage#readme",
-  "dependencies": {
-    "pngjs": "^3.4.0"
-  },
-  "devDependencies": {
-    "eslint": "^6.1.0",
-    "tape": "^4.11.0"
-  }
+    "name": "matches-subimage",
+    "version": "1.0.0",
+    "description": "Lightweight library that finds matches of an image within another image",
+    "main": "index.js",
+    "scripts": {
+        "lint": "eslint",
+        "test": "node test/test.js"
+    },
+    "repository": {
+        "type": "git",
+        "url": "git+https://github.com/dieterwalckiers/matches-subimage.git"
+    },
+    "keywords": [
+        "image",
+        "pixels",
+        "comparison",
+        "match",
+        "matches",
+        "subimage",
+        "within",
+        "image",
+        "inside"
+    ],
+    "author": "Dieter Walckiers",
+    "license": "MIT",
+    "bugs": {
+        "url": "https://github.com/dieterwalckiers/matches-subimage/issues"
+    },
+    "homepage": "https://github.com/dieterwalckiers/matches-subimage#readme",
+    "devDependencies": {
+        "pngjs": "^3.4.0",
+        "eslint": "^6.1.0",
+        "tape": "^4.11.0"
+    }
 }
diff --git a/src/delta.js b/src/delta.js
index 665cb2b..383f79d 100644
--- a/src/delta.js
+++ b/src/delta.js
@@ -2,15 +2,13 @@ module.exports = pixelMatches;
 
 // calculate color difference according to the paper "Measuring perceived color difference
 // using YIQ NTSC transmission color space in mobile applications" by Y. Kotsarenko and F. Ramos
-function pixelMatches(img1, img2, k, m, maxDelta, yOnly) {
+function pixelMatches(img1, img2, k, m, maxDelta, options, yOnly) {
 
     if ((k + 3) >= img1.length) {
-        return false;
-        // throw new Error(`Cannot get positions ${k} through ${k + 3} from img array of length ${img1.length}`);
+        throw new Error(`Cannot get positions ${k} through ${k + 3} from img array of length ${img1.length}`);
     }
     if ((m + 3) >= img2.length) {
-        return false;
-        // throw new Error(`Cannot get positions ${m} through ${m + 3} from img array of length ${img2.length}`);
+        throw new Error(`Cannot get positions ${m} through ${m + 3} from img array of length ${img2.length}`);
     }
 
     let r1 = img1[k + 0];
@@ -50,7 +48,6 @@ function pixelMatches(img1, img2, k, m, maxDelta, yOnly) {
         const q = rgb2q(r1, g1, b1) - rgb2q(r2, g2, b2);
         delta = 0.5053 * y * y + 0.299 * i * i + 0.1957 * q * q;
     }
-    // console.log(`d:${delta}, compared to maxDelta (${maxDelta}) getting a ${delta <= maxDelta ? "match" :"non-match"}`);
     return delta <= maxDelta;    
 }
 
diff --git a/src/index.js b/src/index.js
index e057e83..83dfef7 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,19 +1,15 @@
 const pixelMatches = require("./delta");
-module.exports = subImageFoundInImage;
+module.exports = subImageMatch;
 
 const defaultOptions = {
     threshold: 0.1,         // matching threshold (0 to 1); smaller is more sensitive
     // includeAA: false,       // whether to skip anti-aliasing detection. WIP (see pixelmatch package)
 };
 
-function subImageFoundInImage(img, subImg, optionsParam) {
+function subImageMatch(img, subImg, optionsParam) {
 
     const { data: imgData, width: imgWidth, height: imgHeight } = img;
-    const { data: subImgData, width: subImgWidth, height: subImgHeight } = subImg;
-
-    console.log(`img is ${imgWidth} x ${imgHeight}`);
-    console.log(`subImg is ${subImgWidth} x ${subImgHeight}`);
-
+    const { data: subImgData, width: subImgWidth } = subImg;
 
     if (!isPixelData(imgData) || !isPixelData(subImgData)) {
         throw new Error("Image data: Uint8Array, Uint8ClampedArray or Buffer expected.");
@@ -24,8 +20,6 @@ function subImageFoundInImage(img, subImg, optionsParam) {
     const options = Object.assign({}, defaultOptions, optionsParam);
     const maxDelta = 35215 * options.threshold * options.threshold;
 
-    console.log("max delta", maxDelta);
-
     let subImgPos = 0;
     let matchingTopRowStartX = 0;
     let matchingTopRowStartY = 0;
@@ -48,10 +42,10 @@ function subImageFoundInImage(img, subImg, optionsParam) {
 
                 matchingTopRowX++;
                 if (matchingTopRowX === subImgWidth) {
-                    // console.log(`rowmatch on ${matchingTopRowStartY}-${matchingTopRowStartX}, now checking the rows below!`);
-                    if (subImageFoundOnCoordinates(img, subImg, matchingTopRowStartY, matchingTopRowStartX, maxDelta)) {
+                    if (subImageMatchOnCoordinates(img, subImg, matchingTopRowStartY, matchingTopRowStartX, maxDelta)) {
                         return true;
                     }
+                    x = matchingTopRowStartX; // put our search position x back to where the matching row began
                     matchingTopRowX = 0;
                 }
             } else {
@@ -62,30 +56,26 @@ function subImageFoundInImage(img, subImg, optionsParam) {
     return false;
 }
 
-function subImageFoundOnCoordinates(img, subImg, matchY, matchX, maxDelta) {
+function subImageMatchOnCoordinates(img, subImg, matchY, matchX, maxDelta) {
     const { data: imgData, width: imgWidth } = img;
     const { data: subImgData, width: subImgWidth, height: subImgHeight } = subImg;
     let subImgX = 0;
     let subImgY = 0;
     for (let imgY = matchY; imgY < (matchY + subImgHeight); imgY++) {
         subImgX = 0;
-        console.log(`checking row ${imgY} (${subImgY} in subImg), from ${matchX} to ${matchX + subImgWidth - 1}`);
 
         for (let imgX = matchX; imgX < (matchX + subImgWidth); imgX++) {
 
             const imgPos = posFromCoordinates(imgY, imgX, imgWidth);
             const subImgPos = posFromCoordinates(subImgY, subImgX, subImgWidth);
-            const matches = pixelMatches(imgData, subImgData, imgPos, subImgPos, maxDelta);
+            const matches = pixelMatches(imgData, subImgData, imgPos, subImgPos, maxDelta, undefined, imgY === 5);
             if (!matches) {
-                console.log(`matches is ${matches}, so nope for coords ${imgY}-${imgX} (${subImgY}-${subImgX} on subImg)`);
                 return false;
             }
             subImgX++;
         }
-        subImgY >= 0 && console.log(`row ${subImgY} matches`);
         subImgY++;
     }
-    console.log(`complete match on ${matchY}-${matchX}`);
     return true;
 }
 
diff --git a/test/test.js b/test/test.js
index 0420c92..5d00691 100644
--- a/test/test.js
+++ b/test/test.js
@@ -2,57 +2,73 @@ const test = require("tape");
 const pngjs = require("pngjs");
 const path = require("path");
 const fs = require("fs");
-const subImageFoundInImage = require("../src");
+const subImageMatch = require("../src");
 
 // eslint-disable-next-line no-undef
 const getTestImgPath = (filename) => path.join(__dirname, `testimages/${filename}.png`);
 
-// test("throws error if provided wrong image data format", (t) => {
-//     const err = "Image data: Uint8Array, Uint8ClampedArray or Buffer expected";
-//     const arr = new Uint8Array(4 * 20 * 20);
-//     const bad = new Array(arr.length).fill(0);
-//     t.throws(() => subImageFoundInImage(bad, arr), err);
-//     t.throws(() => subImageFoundInImage(arr, bad), err);
-//     t.end();
-// });
-
-
-// test("throws error sub image is larger than base image", (t) => {
-//     const err = "Subimage is larger than base image";
-//     const smallArr = new Uint8Array(4 * 10 * 10);
-//     const largeArr = new Uint8Array(4 * 20 * 20);
-//     t.throws(() => subImageFoundInImage(smallArr, largeArr), err);
-//     t.end();
-// });
-
-// test("Matches on 2 identical images", (t) => {
-//     const img1 = readImage(getTestImgPath("1"));
-//     const img2 = readImage(getTestImgPath("1"));
-//     const matches = subImageFoundInImage(img1, img2);
-//     t.ok(matches, "should find match");
-//     t.end();
-// });
-
-// test("Doesn't match on 2 different images", (t) => {
-//     const img1 = readImage(getTestImgPath("1-sub"));
-//     const img2 = readImage(getTestImgPath("2"));
-//     const matches = subImageFoundInImage(img1, img2);
-//     t.notOk(matches, "shouldn't find match");
-//     t.end();
-// });
+test("throws error if provided wrong image data format", (t) => {
+    const err = "Image data: Uint8Array, Uint8ClampedArray or Buffer expected";
+    const arr = new Uint8Array(4 * 20 * 20);
+    const bad = new Array(arr.length).fill(0);
+    t.throws(() => subImageMatch(bad, arr), err);
+    t.throws(() => subImageMatch(arr, bad), err);
+    t.end();
+});
+
+
+test("throws error sub image is larger than base image", (t) => {
+    const err = "Subimage is larger than base image";
+    const smallArr = new Uint8Array(4 * 10 * 10);
+    const largeArr = new Uint8Array(4 * 20 * 20);
+    t.throws(() => subImageMatch(smallArr, largeArr), err);
+    t.end();
+});
+
+test("Matches on 2 identical images", (t) => {
+    const img1 = readImage(getTestImgPath("1"));
+    const img2 = readImage(getTestImgPath("1"));
+    const matches = subImageMatch(img1, img2);
+    t.ok(matches, "should find match");
+    t.end();
+});
+
+test("Doesn't match on 2 different images", (t) => {
+    const img1 = readImage(getTestImgPath("1-sub"));
+    const img2 = readImage(getTestImgPath("2"));
+    const matches = subImageMatch(img1, img2);
+    t.notOk(matches, "shouldn't find match");
+    t.end();
+});
 
 test("Find sub-image match within image", (t) => {
     const img = readImage(getTestImgPath("1"));
     const subImg = readImage(getTestImgPath("1-sub"));
-    const matches = subImageFoundInImage(img, subImg);
+    const matches = subImageMatch(img, subImg);
+    t.ok(matches, "should find match");
+    t.end();
+});
+
+test("Find sub-image match within image when first row matches in multiple places", (t) => {
+    const img = readImage(getTestImgPath("1b"));
+    const subImg = readImage(getTestImgPath("1-sub"));
+    const matches = subImageMatch(img, subImg);
     t.ok(matches, "should find match");
     t.end();
 });
 
-test("Find sub-image match within image (larger imgs)", (t) => {
-    const img = readImage(getTestImgPath("3b"));
-    const subImg = readImage(getTestImgPath("3-sub"));
-    const matches = subImageFoundInImage(img, subImg);
+test("Find sub-image match within image when first row matches in multiple places 2", (t) => {
+    const img = readImage(getTestImgPath("1c"));
+    const subImg = readImage(getTestImgPath("1-sub"));
+    const matches = subImageMatch(img, subImg);
+    t.ok(matches, "should find match");
+    t.end();
+});
+
+test("Find sub-image match within image when first row matches in multiple places 3", (t) => {
+    const img = readImage(getTestImgPath("1d"));
+    const subImg = readImage(getTestImgPath("1-sub"));
+    const matches = subImageMatch(img, subImg);
     t.ok(matches, "should find match");
     t.end();
 });
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diff --git a/test/testimages/3b-var.png b/test/testimages/3b-var.png
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