diff --git a/4.2.4-Header-Editor.md b/4.2.4-Header-Editor.md
index 6b47205..84eafa2 100644
--- a/4.2.4-Header-Editor.md
+++ b/4.2.4-Header-Editor.md
@@ -5,6 +5,7 @@ Header Editor is an extension that allows you to modify the request header and r
 :exclamation: pay attention, header names are case sensitive
 
 :small_orange_diamond: remove all ETag's
+ * Note: if you disable disk *and* memory cache, this is not required
  * Test: https://httpbin.org/
  * Test: http://lucb1e.com/rp/cookielesscookies/