diff --git a/FABRIC-2.md b/FABRIC-2.md
index 2101c0a..a97eeb8 100644
--- a/FABRIC-2.md
+++ b/FABRIC-2.md
@@ -184,7 +184,11 @@ and recorded.
   `hotwords_cache_promote()` after a `DictEntry*` NULL check has already passed. **Ruling:**
   flag and leave as-is, matching the `arch_mmu_init()`/block_subsystem precedent — real
   defect, no live trigger, not fixed without explicit instruction.
-- [ ] `heartbeat_trust()` has zero callers — dead code.
+- [x] **`heartbeat_trust()` has zero callers — dead code.** Stale claim, corrected 2026-08-13:
+  `heartbeat_trust()` (`src/starkernel/heartbeat.c:205`) is called from
+  `src/starkernel/kernel_main.c:913`, printed as the `trust=0x...` field of the M5
+  heartbeat boot-milestone diagnostic line, alongside tick count and variance. Not dead
+  code — closed as investigated/not-a-bug.
 - [ ] `m5_time_trust`/`m5_variance` are declared and never used.
 - [ ] `src/*.c.bak` files (`vm.c.bak`, `doe_metrics.c.bak`, `inference_engine.c.bak`) remain
   tracked in git at `src/` top level. Repo hygiene debt, not intentional (also noted in