diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..2449e01
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,37 @@
+name: ci
+
+on:
+  push:
+    branches:
+      - '**' #every branch
+  pull_request:
+    branches:
+      - '**' #every branch
+
+jobs:
+  setup:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Available platforms
+        run: echo ${{ steps.buildx.outputs.platforms }}
+  build:
+    runs-on: ubuntu-latest
+    needs: setup
+    steps:
+      - uses: actions/checkout@master
+        with:
+          ref: ${{ github.ref }}
+      - name: Build
+        env:
+          VERSION: ${{ github.run_number }}
+        run: |
+          echo "Start CI build"
+          docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+          docker buildx create --name multibuilder
+          docker buildx use multibuilder
+          docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 -t bbernhard/signal-cli-rest-api:${VERSION}-ci .
+
diff --git a/doc/HOMEASSISTANT.md b/doc/HOMEASSISTANT.md
index 9d16e45..3c50add 100644
--- a/doc/HOMEASSISTANT.md
+++ b/doc/HOMEASSISTANT.md
@@ -57,10 +57,16 @@ e.g:
 
 `curl -X POST -H "Content-Type: application/json" 'http://127.0.0.1:8080/v1/register/+431212131491291/verify/123-456'`
 
-When you try to register a number, if you receive a response like `{"error":"Captcha required for verification (null)\n"}` then Signal is requiring a captcha. To register the number you must do the following:
+If you are trying to verify a number that has PIN assigned to it you will get an error message saying: "Verification failed! This number is locked with a pin". You can provide the PIN using "--data '{"pin": "your registration lock pin"}'" to the curl verification call:
+
+`curl -X POST -H "Content-Type: application/json" --data '{"pin": "your registration lock pin"}' 'http://127.0.0.1:8080/v1/register/+431212131491291/verify/123-456'`
+
+
+When you try to register a number, if you receive a response like `{"error":"Captcha required for verification (null)\n"}` then Signal is requiring a captcha. To register the number you must do the following (in Mozilla Firefox):
 1. Go to  [https://signalcaptchas.org/registration/generate.html](https://signalcaptchas.org/registration/generate.html)
 2. Open the developer console
-3. Find the line that looks like this: `Prevented navigation to “signalcaptcha://{captcha value}” due to an unknown protocol.` Copy the captcha value
+3. Answer the captcha
+3. On the developer console, find the line that looks like this: `Prevented navigation to “signalcaptcha://{captcha value}” due to an unknown protocol.` Copy the captcha value
 4. Use it to make the registration call like this:
 
 `curl -X POST -H "Content-Type: application/json" -d '{"captcha":"{captcha value}"}' 'http://127.0.0.1:8080/v1/register/<number>`