diff --git a/java/google/registry/model/registrar/Registrar.java b/java/google/registry/model/registrar/Registrar.java
index 456561de4..315a493ce 100644
--- a/java/google/registry/model/registrar/Registrar.java
+++ b/java/google/registry/model/registrar/Registrar.java
@@ -174,9 +174,9 @@ public class Registrar extends ImmutableObject implements Buildable, Jsonifiable
   /**
    * The types for which a {@link Registrar} should be included in WHOIS and RDAP output. We exclude
    * registrars of type TEST. We considered excluding INTERNAL as well, but decided that
-   * troubleshooting would be easier with INTERNAL registrars visible.
+   * troubleshooting would be easier with INTERNAL registrars visible. Before removing other types
+   * from view, carefully consider the effect on things like prober monitoring and OT&E.
    */
-  //TODO(b/27274151): Expand documentation of this field.
   private static final ImmutableSet<Type> PUBLICLY_VISIBLE_TYPES =
       immutableEnumSet(
           Type.REAL, Type.PDT, Type.OTE, Type.EXTERNAL_MONITORING, Type.MONITORING, Type.INTERNAL);