diff --git a/oauth2_http/java/com/google/auth/oauth2/IdTokenCredentials.java b/oauth2_http/java/com/google/auth/oauth2/IdTokenCredentials.java
index 42bdbaa6e..c616baade 100644
--- a/oauth2_http/java/com/google/auth/oauth2/IdTokenCredentials.java
+++ b/oauth2_http/java/com/google/auth/oauth2/IdTokenCredentials.java
@@ -161,6 +161,7 @@ public static Builder newBuilder() {
     return new Builder();
   }
 
+  /** Builder of IdTokenCredentials. For usage and examples, see {@link IdTokenCredentials} */
   public static class Builder extends OAuth2Credentials.Builder {
 
     private IdTokenProvider idTokenProvider;