diff --git a/chrome/browser/permissions/permission_request.h b/chrome/browser/permissions/permission_request.h
index f4473c3f..b093c8d 100644
--- a/chrome/browser/permissions/permission_request.h
+++ b/chrome/browser/permissions/permission_request.h
@@ -15,12 +15,16 @@
 }
 
 // Used for UMA to record the types of permission prompts shown.
-// This corresponds to the PermissionRequestType enum in
-// src/tools/metrics/histograms.xml. The usual rules of updating UMA values
-// applies to this enum:
+// When updating, you also need to update:
+//   1) The PermissionRequestType enum in tools/metrics/histograms/enums.xml.
+//   2) The PermissionRequestTypes suffix list in
+//      tools/metrics/histograms/histograms.xml.
+//   3) GetPermissionRequestString in
+//      chrome/browser/permissions/permission_uma_util.cc.
+//
+// The usual rules of updating UMA values applies to this enum:
 // - don't remove values
 // - only ever add values at the end
-// - keep the PermissionRequestType enum in sync with this definition.
 enum class PermissionRequestType {
   UNKNOWN = 0,
   MULTIPLE = 1,
@@ -39,6 +43,7 @@
   PERMISSION_MEDIASTREAM_CAMERA = 14,
   PERMISSION_ACCESSIBILITY_EVENTS = 15,
   PERMISSION_CLIPBOARD_READ = 16,
+  PERMISSION_SECURITY_KEY_ATTESTATION = 17,
   // NUM must be the last value in the enum.
   NUM
 };