diff --git a/google-cloud-clients/google-cloud-containeranalysis/src/test/java/com/google/cloud/devtools/containeranalysis/v1/GrafeasInteropTest.java b/google-cloud-clients/google-cloud-containeranalysis/src/test/java/com/google/cloud/devtools/containeranalysis/v1/ITGrafeasInteropTest.java
similarity index 87%
rename from google-cloud-clients/google-cloud-containeranalysis/src/test/java/com/google/cloud/devtools/containeranalysis/v1/GrafeasInteropTest.java
rename to google-cloud-clients/google-cloud-containeranalysis/src/test/java/com/google/cloud/devtools/containeranalysis/v1/ITGrafeasInteropTest.java
index 0cdcb7315864..53bc9630e429 100644
--- a/google-cloud-clients/google-cloud-containeranalysis/src/test/java/com/google/cloud/devtools/containeranalysis/v1/GrafeasInteropTest.java
+++ b/google-cloud-clients/google-cloud-containeranalysis/src/test/java/com/google/cloud/devtools/containeranalysis/v1/ITGrafeasInteropTest.java
@@ -22,7 +22,12 @@
 import java.io.IOException;
 import org.junit.Test;
 
-public class GrafeasInteropTest {
+/**
+ * This test requires application default credentials. They are available if running in Google
+ * Compute Engine. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must point to
+ * a file containing the credentials.
+ */
+public class ITGrafeasInteropTest {
 
   @Test
   public void createsGrafeasClient() throws IOException {