diff --git a/chromium_src/components/content_settings/core/common/content_settings_types.mojom b/chromium_src/components/content_settings/core/common/content_settings_types.mojom
index 5954c0e94e8f..8ae575b31960 100644
--- a/chromium_src/components/content_settings/core/common/content_settings_types.mojom
+++ b/chromium_src/components/content_settings/core/common/content_settings_types.mojom
@@ -24,6 +24,8 @@ enum ContentSettingsType {
   BRAVE_HTTPS_UPGRADE,
   BRAVE_REMEMBER_1P_STORAGE,
   BRAVE_LOCALHOST_ACCESS,
+  // Allow a site to open Leo (in side panel on Desktop).
+  // This is limited to Brave Search only.
   BRAVE_AI_CHAT,
 
   BRAVE_WEBCOMPAT_NONE,