diff --git a/stack.yaml b/stack.yaml
index 6902e47df..66e15804b 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -5,6 +5,8 @@ nix:
   packages: [perl gmp ncurses zlib]
 
 resolver: nightly-2021-12-16
+#resolver: nightly-2022-01-10
+# ghc 9.0.2, waiting for https://gitlab.haskell.org/ghc/ghc/-/issues/20592
 
 packages:
 - hledger-lib
diff --git a/stack9.2.yaml b/stack9.2.yaml
index 42477e7fe..affc5c528 100644
--- a/stack9.2.yaml
+++ b/stack9.2.yaml
@@ -1,5 +1,6 @@
 # stack build plan using GHC 9.2.1
 # XXX This is WIP; some deps like shakespeare don't build yet. hledger-lib builds.
+# possibly related: https://gitlab.haskell.org/ghc/ghc/-/issues/20592
 
 nix:
   pure: false