diff --git a/tools/queue_claim_check.py b/tools/queue_claim_check.py
index 57e39df..b7e6c65 100644
--- a/tools/queue_claim_check.py
+++ b/tools/queue_claim_check.py
@@ -588,9 +588,11 @@ FIXTURES = [
 
     # The live defect these three cells were written for (2026-10-19): this file
     # had no fence state, so a tick quoting an example record inside a fenced
-    # block opened a phantom item. Pre-fix the first cell reads
-    # ['Q60:CLOSED', 'Q99:OPEN', 'Q99:CLOSED'] and the second reads two Q61
-    # records (the fenced `**Status:` inherited the header, then collided).
+    # block opened a phantom item. Measured pre-fix: the first cell reads
+    # ['Q60:CLOSED', 'Q99:CLOSED'] -- a quoted item in the open set -- and the
+    # second reads two colliding Q61 rows (the fenced `**Status:` inherited the
+    # header). The third is identical on both sides by design: an unclosed fence
+    # fails OPEN, so the cell pins the FENCE_UNCLOSED line, not the masking.
     ('fence: a record inside a ``` block is quoted material, not a record',
      '## Q60 — section\n\n**Q60 — OPEN (lane).**\n\n**Q60 — DONE at 4010b96.**\n\n'
      'Prose quoting a tick:\n\n```\n**Q99 — OPEN (pipe).**\n'