diff --git a/ci/arm64-rpi/packer-builder-arm b/ci/arm64-rpi/packer-builder-arm
new file mode 160000
index 000000000..6636c687e
--- /dev/null
+++ b/ci/arm64-rpi/packer-builder-arm
@@ -0,0 +1 @@
+Subproject commit 6636c687ece53f7d1f5f2b35aa41f0e6132949c4
diff --git a/pull_request_template.md b/pull_request_template.md
index 85fd51d8e..9d7db1900 100644
--- a/pull_request_template.md
+++ b/pull_request_template.md
@@ -1,2 +1,4 @@
 Thank you for your contribution to RaspiBlitz. Before submitting this PR, please make sure:
-- [ ] That its based against the `dev` brach - not the default release branch.
+- [ ] it is based against the `dev` branch - not the default release branch.
+- [ ] format shell scripts with [shellcheck](https://www.shellcheck.net/) to improve readability.
+(this entry can be deleted)