diff --git a/.github/workflows/openapi.yml b/.github/workflows/openapi.yml
new file mode 100644
index 00000000..2d5f996a
--- /dev/null
+++ b/.github/workflows/openapi.yml
@@ -0,0 +1,23 @@
+name: Validate openapi spec
+on:
+  push:
+    branches:
+      - main
+    tags: ['[0-9]*']
+  pull_request:
+    branches:
+      - main
+      - 'release-*'
+
+jobs:
+  validate:
+    name: Validate
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Validate
+      shell: bash
+      run: |
+        docker run --rm -v "${PWD}:/local" \
+            openapitools/openapi-generator-cli validate \
+            -i /local/crates/server/openapi.yaml
diff --git a/crates/server/openapi.yaml b/crates/server/openapi.yaml
index 0e102c3d..5c4b73fc 100644
--- a/crates/server/openapi.yaml
+++ b/crates/server/openapi.yaml
@@ -693,6 +693,8 @@ paths:
 components:
   headers:
     WargRegistryHeader:
+      name: Warg-Registry
+      in: header
       description: If present and supported, this registry responds on behalf of the other registry specified in this header value.
       required: false
       schema: