diff --git a/README.md b/README.md
index 5533defd..a2db74d2 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,8 @@ The action's step needs to run after your test suite has outputted an LCOV file.
 | `base-path`           | _optional_ | Path to the root folder of the project the coverage was collected in. Should be used in monorepos so that coveralls can process the LCOV correctly (e.g. packages/my-project) |
 | `git-branch`          | _optional_ | Default: GITHUB_REF environment variable. Override the branch name. |
 | `git-commit`          | _optional_ | Default: GITHUB_SHA environment variable. Override the commit SHA. |
+| `compare-ref`         | _optional_ | Branch name to compare coverage with. Specify if you want to always check coverage change for PRs against one branch. |
+| `compare-sha`         | _optional_ | Commit SHA to compare coverage with. |
 
 ### Outputs:
 
diff --git a/action.yml b/action.yml
index 80ba7c14..a04a3c54 100644
--- a/action.yml
+++ b/action.yml
@@ -38,6 +38,12 @@ inputs:
   git-commit:
     description: 'Override the commit sha'
     required: false
+  compare-ref:
+    description: 'Branch name to use as the base for coverage results'
+    required: false
+  compare-sha:
+    description: 'Commit SHA to use as the base for coverage results'
+    required: false
   debug:
     description: 'Enable debug output'
     required: false
@@ -102,3 +108,5 @@ runs:
         COVERALLS_GIT_BRANCH: ${{ inputs.git-branch }}
         COVERALLS_GIT_COMMIT: ${{ inputs.git-commit }}
         COVERALLS_REPO_TOKEN: ${{ inputs.github-token }}
+        COVERALLS_COMPARE_REF: ${{ inputs.compare-ref }}
+        COVERALLS_COMPARE_SHA: ${{ inputs.compare-sha }}