diff --git a/TODO.md b/TODO.md
index 678f9e9..f8f7611 100644
--- a/TODO.md
+++ b/TODO.md
@@ -17,7 +17,7 @@ problem, never code.
 
 ## What to do next, in order
 
-Twenty-one things, ranked. The tiers are the argument: the first finishes what
+Twenty-two things, ranked. The tiers are the argument: the first finishes what
 `plan/unit-rules.md` already promises, the second widens what helm can score at
 all, and the third is what makes any of it reach a player. Everything below
 appears again in its own section with the detail; this is the order to take
@@ -83,29 +83,34 @@ to helm.
     in `helm-query`, which helm-mcp and the boundary both read. What is left
     is headquarters': `web/src/units.ts` still has a filter table of its own,
     and that is the second implementation the epic warns about.
-15. **An identity for the catalogue.** `units.json` and `loadout.json` carry a
+15. **Drop the index's duplicated header.** `units.json` writes `megamek` and
+    `helm` at the top level as well as inside `build`, because
+    headquarters-api refuses an index it cannot find a top-level `megamek` in
+    and falls back to silhouettes. Delete both once
+    `services/api/src/units.rs` reads `build`.
+16. **An identity for the catalogue.** `units.json` and `loadout.json` carry a
     `build` block and refuse to be joined across runs; `catalogue.jsonl` is
     JSON Lines with nowhere to put one, and is keyed only by the prefix it is
     published under. Two dumps of one MegaMek release are not interchangeable
     - see the note in CLAUDE.md - so the prefix is not enough.
-16. **The redistribution question.** MegaMek's data is CC BY-NC-SA and serving
+17. **The redistribution question.** MegaMek's data is CC BY-NC-SA and serving
     an index of it to browsers is redistribution. It needs a decision and an
     attribution mechanism *before* 13 ships.
-17. **Provenance on every record.** Which MegaMek, which producer, which
+18. **Provenance on every record.** Which MegaMek, which producer, which
     `RULES_VERSION`. The constants exist and nothing writes them into the
     database or into an ATProto record, so a stored figure cannot be told from
     one computed against a different MegaMek.
-18. **The attribution and the repair list on a match page.**
+19. **The attribution and the repair list on a match page.**
     `plan/after-action.md`. The pieces are built and cross the wasm boundary;
     what is missing is the screen that reads them.
-19. **Damage that persists between matches.** `plan/campaign.md`. The
+20. **Damage that persists between matches.** `plan/campaign.md`. The
     mechanical half exists; storing a force's condition as a record and reading
     it back is the rest, and the construct-write-read round trip supports it.
-20. **Formation validation.** `list_formations` and `validate_formation`
+21. **Formation validation.** `list_formations` and `validate_formation`
     against the Campaign Operations blueprints - "is this a legal Fire Lance".
     Validation before generation, and it needs no faction data: it is role and
     count, both of which helm holds.
-21. **Ingest `data/forcegenerator/`.** 40 era files of per-faction availability
+22. **Ingest `data/forcegenerator/`.** 40 era files of per-faction availability
     weights, `factions.xml`, and 61 faction rulesets that are a small DSL of
     their own. This is the foundation for force generation, faction filtering
     and era-correct scenarios, and nothing above it should be attempted until
diff --git a/crates/helm-cli/src/build.rs b/crates/helm-cli/src/build.rs
index 15f1ba8..037f87e 100644
--- a/crates/helm-cli/src/build.rs
+++ b/crates/helm-cli/src/build.rs
@@ -443,6 +443,8 @@ pub(crate) fn index(args: &[String]) -> Result<(), String> {
     }
 
     let mut document = helm_query::Index {
+        megamek: build.megamek.clone(),
+        helm: build.helm.clone(),
         build: build.clone(),
         sprite_base: "data/images/units".to_string(),
         counts,
diff --git a/crates/helm-query/src/facets.rs b/crates/helm-query/src/facets.rs
index 96c4eb7..40a0448 100644
--- a/crates/helm-query/src/facets.rs
+++ b/crates/helm-query/src/facets.rs
@@ -137,6 +137,17 @@ pub struct Counts {
 #[derive(Serialize, Deserialize)]
 pub struct Index {
     pub build: Build,
+    /// The release, again, at the top level.
+    ///
+    /// Where it was before there was a build block, and where headquarters-api
+    /// still reads it: that service refuses an index it cannot find a
+    /// `megamek` in and falls back to drawing silhouettes. Written until it
+    /// reads `build.megamek` instead, and no longer.
+    #[serde(default, skip_serializing_if = "String::is_empty")]
+    pub megamek: String,
+    /// The same, for the helm build. See `megamek` above.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub helm: Option<String>,
     /// Relative to the release, and the prefix a sprite path is joined to.
     /// The bucket holds the art tree at this path under the same version, so
     /// a consumer needs no second convention to turn one into an address.
@@ -242,6 +253,8 @@ mod tests {
     fn document(names: &[&str]) -> Index {
         Index {
             build: build(names),
+            megamek: "0.51.0".into(),
+            helm: None,
             sprite_base: "data/images/units".into(),
             counts: Counts::default(),
             units: names