diff --git a/03-DESIGN/01-to-be/47-milestones/G-20-lead-answers.md b/03-DESIGN/01-to-be/47-milestones/G-20-lead-answers.md
index 121a0363..a23bf1b3 100644
--- a/03-DESIGN/01-to-be/47-milestones/G-20-lead-answers.md
+++ b/03-DESIGN/01-to-be/47-milestones/G-20-lead-answers.md
@@ -266,3 +266,7 @@ names the principle that settles it, and is cited as "design 47 G A-n".
   want from an assignment graph revision it keeps, so the pass keeps that revision first (assigngraph.Compute and Keep
   per catalog revision taken in), and `wanted`'s `revision` and `source` are that kept revision's and its catalog's.
   No stand-in value.
+- **A-68** (§375, A-66; principles 1 and 7) The indexer keeps what `outdated` compares against in its own state, as it
+  hears the events: `toolchain.<language>` the newest `toolchain-agreed` per language, and `delivered.<module>` the
+  newest `version-delivered` per module, in the same own state as A-66's keys; no new state, no field of `VersionEntry`,
+  no scan of the streams at a call.