diff --git a/README.md b/README.md
index ae76091..ccb0dc6 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,8 @@ jobs:
 
 -   `junit_folder`: (Optional) A folder containing JUnit XML files. Make sure the name of each file reflects the name of the test suite. In this way, different test suite runs can be grouped under the same test suite.
 
+-   `subdirectory`: (Optional) Path prefix for the project being measured. Set this when reporting coverage for a subproject in a monorepo (e.g. `app`, `packages/web`). Multiple jobs running for the same commit with different `subdirectory` values are stored as separate uploads and rolled up into a single consolidated coverage status (see [Monorepo support](#monorepo-support)).
+
 -   `devhub_api_key`: (Required) You will need to create an API key in the settings of your installed app and save it as a secret in GitHub
     Actions settings.
 
@@ -63,6 +65,37 @@ jobs:
 
 -   `percentage`: The coverage percentage.
 
+## Monorepo support
+
+For monorepos with multiple projects under one repository, run the action once per project with a different `subdirectory:`. Each upload is stored separately, and the `coverbot` commit status reflects the **consolidated** total across every upload received for that sha.
+
+```yaml
+jobs:
+  coverage-app:
+    steps:
+      - uses: devhub-tools/coverbot-action@v1
+        with:
+          format: elixir
+          file: app/cover/excoveralls.json
+          subdirectory: app
+          domain: ${{ vars.DEVHUB_DOMAIN }}
+          devhub_api_key: ${{ secrets.DEVHUB_API_KEY }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+
+  coverage-web:
+    steps:
+      - uses: devhub-tools/coverbot-action@v1
+        with:
+          format: lcov
+          file: web/coverage/lcov.info
+          subdirectory: web
+          domain: ${{ vars.DEVHUB_DOMAIN }}
+          devhub_api_key: ${{ secrets.DEVHUB_API_KEY }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+```
+
+Each job posts to the same `coverbot` status; whichever finishes second sees both totals summed in the message (e.g. `30 lines covered out of 200 (15.00%)`).
+
 ## Add the coverage badge to your README.md
 
 ```markdown
diff --git a/dist/index.js b/dist/index.js
index c504920..59ee053 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -36712,6 +36712,7 @@ function run() {
                 relevant,
                 percentage,
                 files,
+                subdirectory: subdirectory || null,
                 owner: repoOwner,
                 repo,
                 default_branch: (_a = github.context.payload.repository) === null || _a === void 0 ? void 0 : _a.default_branch,
@@ -36748,7 +36749,7 @@ function run() {
                 }
                 octokit.rest.checks.update(Object.assign(Object.assign({}, github.context.repo), { check_run_id: checkRun.id, conclusion: res.result.state }));
                 if (relevantForPatch && relevantForPatch > 0) {
-                    octokit.rest.repos.createCommitStatus(Object.assign(Object.assign({}, github.context.repo), { sha: res.result.sha, state: Number(patchPercentage) >= Number(percentage) ? "success" : "failure", context: "coverbot (patch)", description: `${coveredForPatch} lines covered out of ${relevantForPatch} (${patchPercentage}%)`, target_url: `https://${domain}/coverbot/coverage/${res.result.id}` }));
+                    octokit.rest.repos.createCommitStatus(Object.assign(Object.assign({}, github.context.repo), { sha: res.result.sha, state: Number(patchPercentage) >= Number(percentage) ? "success" : "failure", context: "coverbot (patch)", description: `${coveredForPatch} lines covered out of ${relevantForPatch} (${patchPercentage}%)`, target_url: `https://${domain}/coverbot/coverage/${res.result.repository_id}/${res.result.sha}` }));
                 }
             }
         }
diff --git a/src/main.ts b/src/main.ts
index 46f3500..f85da53 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -33,6 +33,7 @@ async function run(): Promise<void> {
       relevant,
       percentage,
       files,
+      subdirectory: subdirectory || null,
       owner: repoOwner,
       repo,
       default_branch: github.context.payload.repository?.default_branch,
@@ -105,7 +106,7 @@ async function run(): Promise<void> {
           state: Number(patchPercentage) >= Number(percentage) ? "success" : "failure",
           context: "coverbot (patch)",
           description: `${coveredForPatch} lines covered out of ${relevantForPatch} (${patchPercentage}%)`,
-          target_url: `https://${domain}/coverbot/coverage/${res.result.id}`,
+          target_url: `https://${domain}/coverbot/coverage/${res.result.repository_id}/${res.result.sha}`,
         })
       }
     }
diff --git a/src/post-coverage.ts b/src/post-coverage.ts
index 2c97fe7..973e610 100644
--- a/src/post-coverage.ts
+++ b/src/post-coverage.ts
@@ -4,6 +4,7 @@ import { TypedResponse } from "@actions/http-client/lib/interfaces"
 
 type CoverageResponse = {
   id: string
+  repository_id: string
   sha: string
   state: "failure" | "success"
   message: string