diff --git a/docs/en/04_Changelogs/4.1.0.md b/docs/en/04_Changelogs/4.1.0.md
index b7ac2be31..567d32b39 100644
--- a/docs/en/04_Changelogs/4.1.0.md
+++ b/docs/en/04_Changelogs/4.1.0.md
@@ -7,6 +7,9 @@
 
 ## Upgrading
 
+Note: if you receive an error message about an undefined constant while
+upgrading with `composer`, re-running the command should solve the issue.
+
 ### Upgrade `public/` folder
 
 This release allows the maintenance of a public webroot folder which separates all