diff --git a/java/com/google/gerrit/server/schema/NotesMigrationSchemaFactory.java b/java/com/google/gerrit/server/schema/NotesMigrationSchemaFactory.java
index 77d71f547d..a4ae7043c2 100644
--- a/java/com/google/gerrit/server/schema/NotesMigrationSchemaFactory.java
+++ b/java/com/google/gerrit/server/schema/NotesMigrationSchemaFactory.java
@@ -28,40 +28,10 @@ public class NotesMigrationSchemaFactory implements SchemaFactory<ReviewDb> {
 
   @Override
   public ReviewDb open() throws OrmException {
-    // There are two levels at which this class disables access to Changes and related tables,
-    // corresponding to two phases of the NoteDb migration:
-    //
-    // 1. When changes are read from NoteDb but some changes might still have their primary storage
-    //    in ReviewDb, it is generally programmer error to read changes from ReviewDb. However,
-    //    since ReviewDb is still the primary storage for most or all changes, we still need to
-    //    support writing to ReviewDb. This behavior is accomplished by wrapping in a
-    //    DisallowedReviewDb.
-    //
-    //    Some codepaths might need to be able to read from ReviewDb if they really need to,
-    //    because they need to operate on the underlying source of truth, for example when reading
-    //    a change to determine its primary storage. To support this, ReviewDbUtil#unwrapDb can
-    //    detect and unwrap databases of this type.
-    //
-    // 2. After all changes have their primary storage in NoteDb, we can completely shut off access
-    //    to the change tables. At this point in the migration, we are by definition not using the
-    //    ReviewDb tables at all; we could even delete the tables at this point, and Gerrit would
-    //    continue to function.
-    //
-    //    This is accomplished by setting the delegate ReviewDb *underneath*
-    //    DisallowReadFromChanges to be a complete no-op, with NoChangesReviewDb. With this
-    //    stub implementation, all read operations return no results, and write operations silently
-    //    do nothing. This implementation is not a public class and callers couldn't do anything
-    //    useful with it even if it were.
-
-    // Disable writes to change tables in ReviewDb (ReviewDb access for changes are No-Ops); all
-    // other table accesses throw runtime exceptions.
+    // TODO(dborowitz): This class is purely vestigial, and documenting the historical reasons for
+    // this specific behavior is not worth it. Remove this class instead.
     ReviewDb db = new NoChangesReviewDb();
-
-    // Second create the wrappers which can be removed by ReviewDbUtil#unwrapDb(ReviewDb).
-    // ReviewDb is no longer supported, make sure that any attempt to read a change from ReviewDb
-    // anyway fails with an exception.
     db = new DisallowedReviewDb(db);
-
     return db;
   }
 }