diff --git a/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix b/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix
index ac7c46041125..10b86ef58d97 100644
--- a/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix
+++ b/pkgs/servers/sql/postgresql/ext/pg_hint_plan.nix
@@ -7,6 +7,7 @@
 
 let
   sources = {
+    # For v18, see https://github.com/ossc-db/pg_hint_plan/issues/224
     "17" = {
       version = "1.7.0";
       hash = "sha256-MNQMePDmGxC8OFIJuVJrhfgU566vkng00+tjeGpGKvs=";