diff --git a/chrome/browser/profiles/DEPS b/chrome/browser/profiles/DEPS
index 0a1ba262babe26..bf1e2077400c38 100644
--- a/chrome/browser/profiles/DEPS
+++ b/chrome/browser/profiles/DEPS
@@ -1,7 +1,8 @@
 specific_include_rules = {
   "chrome_browser_main_extra_parts_profiles.cc": [
     # This is required to create the SiteDataCacheFacadeFactory when a profile
-    # is created.
+    # is created. This file isn't part of the PerformanceManager public API and
+    # its include should be explicitly allowed.
     "+chrome/browser/performance_manager/persistence/site_data/site_data_cache_facade_factory.h"
   ],
 }