diff --git a/Dockerfile b/Dockerfile
index 184c04a..955582e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ FROM python:3.10.7-slim
 
 RUN apt-get update -y && apt-get install -y --fix-missing curl git && rm -rf /var/lib/apt/lists/*
 
-RUN pip3 install git+https://github.com/octue/get-deployment-info@0.2.1
+RUN pip3 install git+https://github.com/octue/get-deployment-info@0.2.2
 
 COPY get_deployment_info/entrypoint.sh /entrypoint.sh
 
diff --git a/README.md b/README.md
index 8b6732c..760a144 100644
--- a/README.md
+++ b/README.md
@@ -4,8 +4,8 @@
 
 # Get deployment info
 
-A GitHub action that gets the information needed to build and deploy an Octue service to the cloud. This information is
-extracted and/or generated from:
+A GitHub action that gets the information needed to build and deploy an Octue service to the cloud from a
+main/production branch or a non-main/development branch. The required information is extracted and/or generated from:
 
 - The action inputs
 - `git`
@@ -25,7 +25,7 @@ steps:
 
   - name: Get deployment info
     id: get-deployment-info
-    uses: octue/get-deployment-info@0.2.1
+    uses: octue/get-deployment-info@0.2.2
     with:
       gcp_project_name: test-project
       gcp_project_number: 1234
@@ -48,6 +48,8 @@ Outputs can be accessed in the usual way. For example, to print all the outputs:
     echo ${{ steps.get-deployment-info.outputs.image_version_tag }}
     echo ${{ steps.get-deployment-info.outputs.short_sha }}
     echo ${{ steps.get-deployment-info.outputs.version_slug }}
+    echo ${{ steps.get-deployment-info.outputs.revision_tag }}
+    echo ${{ steps.get-deployment-info.outputs.revision_tag_slug }}
     echo ${{ steps.get-deployment-info.outputs.gcp_environment }}
     echo ${{ steps.get-deployment-info.outputs.gcp_project_name }}
     echo ${{ steps.get-deployment-info.outputs.gcp_project_number }}
@@ -59,3 +61,22 @@ Outputs can be accessed in the usual way. For example, to print all the outputs:
 
 Note: there's no need to print the outputs for debugging in practice - the action prints them to `stdout` for this very
 purpose.
+
+## Main vs non-main branch deployments
+
+Some of the outputs' values depend on whether the action is run on the `main` branch or a non-`main` branch.
+
+### Main branch deployments
+
+- `revision_tag` is `<version>`
+- `image_version_tag` is `main-<version>`
+- `image_latest_tag` is `main-latest`
+
+### Non-main branch deployments
+
+The truncated branch name (first 12 characters) is used to ensure service names are short enough to be accepted by e.g.
+Cloud Run without having to restrict the length of branch names.
+
+- `revision_tag` is `pull-<truncated branch_tag_kebab>`
+- `image_version_tag` is `pull-<truncated branch_tag_kebab>`
+- `image_latest_tag` is `pull-<truncated branch_tag_kebab>-latest`
diff --git a/action.yaml b/action.yaml
index 355116b..2b35361 100644
--- a/action.yaml
+++ b/action.yaml
@@ -63,7 +63,7 @@ outputs:
 
 runs:
   using: "docker"
-  image: "docker://octue/get-deployment-info:0.2.1"
+  image: "docker://octue/get-deployment-info:0.2.2"
   args:
     - ${{ inputs.gcp_project_name }}
     - ${{ inputs.gcp_project_number }}
diff --git a/get_deployment_info/entrypoint.sh b/get_deployment_info/entrypoint.sh
index a30356d..078aa8b 100644
--- a/get_deployment_info/entrypoint.sh
+++ b/get_deployment_info/entrypoint.sh
@@ -40,7 +40,7 @@ if [ "$BRANCH_TAG_KEBAB" = "main" ]; then
   IMAGE_VERSION_TAG="$BRANCH_TAG_KEBAB-$REVISION_TAG"
   IMAGE_LATEST_TAG="$BRANCH_TAG_KEBAB-latest"
 else
-  REVISION_TAG=pull-$(echo $BRANCH_TAG_KEBAB | tr -d -c 0-9)
+  REVISION_TAG=pull-"${BRANCH_TAG_KEBAB:0:12}"
   IMAGE_VERSION_TAG="$REVISION_TAG"
   IMAGE_LATEST_TAG="$REVISION_TAG-latest"
 fi
diff --git a/pyproject.toml b/pyproject.toml
index 43f6969..18eb94e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "get-deployment-info"
-version = "0.2.1"
+version = "0.2.2"
 description = "A Github Action that gets the information required to build and deploy an Octue service."
 authors = ["Marcus Lugg <marcus@octue.com>"]
 readme = "README.md"