diff --git a/build-constraints.yaml b/build-constraints.yaml
index 8af06410..e491ea96 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8125,6 +8125,7 @@ packages:
 
 # Package flags are applied to individual packages, and override the values of
 # global-flags
+# NB: These flags are shipped to users, ie used in snapshots (#7438)
 package-flags:
     QuickCheck:
         old-random: false