diff --git a/samples/broken-links-ok/.puppeteerrc.cjs b/samples/broken-links-ok/.puppeteerrc.cjs
index d563ce99..6250d4ad 100644
--- a/samples/broken-links-ok/.puppeteerrc.cjs
+++ b/samples/broken-links-ok/.puppeteerrc.cjs
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// [START monitoring_synthetic_monitoring_broken_links_puppeteer_cjs]
 const { join } = require('path');
 
 /**
@@ -20,3 +21,4 @@ const { join } = require('path');
 module.exports = {
   cacheDirectory: join(__dirname, '.cache', 'puppeteer'),
 };
+// [END monitoring_synthetic_monitoring_broken_links_puppeteer_cjs]
diff --git a/samples/generic-puppeteer-nodejs/.puppeteerrc.cjs b/samples/generic-puppeteer-nodejs/.puppeteerrc.cjs
index d563ce99..343d77f1 100644
--- a/samples/generic-puppeteer-nodejs/.puppeteerrc.cjs
+++ b/samples/generic-puppeteer-nodejs/.puppeteerrc.cjs
@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// [START monitoring_synthetic_monitoring_custom_puppeteer_cjs]
 const { join } = require('path');
 
 /**
@@ -20,3 +21,5 @@ const { join } = require('path');
 module.exports = {
   cacheDirectory: join(__dirname, '.cache', 'puppeteer'),
 };
+// [END monitoring_synthetic_monitoring_custom_puppeteer_cjs]
+
diff --git a/samples/generic-puppeteer-nodejs/index.js b/samples/generic-puppeteer-nodejs/index.js
index 446cad75..ece6c2b2 100644
--- a/samples/generic-puppeteer-nodejs/index.js
+++ b/samples/generic-puppeteer-nodejs/index.js
@@ -47,4 +47,4 @@ functions.http('CustomPuppeteerSynthetic', runSyntheticHandler(async ({logger, e
  await browser.close();
 }));
 
-// [START monitoring_synthetic_monitoring_custom_puppeteer_script]
+// [END monitoring_synthetic_monitoring_custom_puppeteer_script]