diff --git a/todo.md b/todo.md
index f86ca29..4602348 100644
--- a/todo.md
+++ b/todo.md
@@ -337,6 +337,10 @@ and 5. Every seat ranked the session's lifecycle hardest and least wanted to mod
       option"). A sender with more than 1000 concurrent multipart `dlr: true` messages silently
       evicts the oldest at `warn`. The inherited architect hit this on the 3am walk.
 
+- [ ] **State in README that `SmppServer.close()` reports each session's unfinished drain as
+      `serverError`.** Only `docs/decisions.md` says so; README's Shutdown section covers the
+      session's own result alone.
+
 - [ ] **Add a ten-line SMPP glossary to the README.** Both juniors and the no-domain mid reported
       the same largest cost: nothing in the repo says what a PDU, `esm_class`, `data_coding`, TON/NPI
       or `submit_sm`-versus-`deliver_sm` are, and the inline spec citations mark a rule without