diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c06c16e..13c3ce8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -41,6 +41,9 @@ jobs:
       - name: Test Servo engine host
         run: cargo test -p ely_servo_host --features servo-engine --test software_host
 
+      - name: Test PRD site compatibility
+        run: cargo test -p ely_servo_host --features servo-engine --test sidecar -- --test-threads=1
+
       - name: Audit source file size
         run: scripts/audit_source_lines.sh
 
diff --git a/README.md b/README.md
index f98279d..25b156c 100644
--- a/README.md
+++ b/README.md
@@ -17,5 +17,6 @@ cargo test --workspace --all-targets
 cargo check -p ely_servo_host --features servo-engine --all-targets
 cargo clippy -p ely_servo_host --features servo-engine --all-targets -- -D warnings
 cargo test -p ely_servo_host --features servo-engine --test software_host
+cargo test -p ely_servo_host --features servo-engine --test sidecar -- --test-threads=1
 cargo run -p ely_app
 ```