diff --git a/specs/threshold_inscription.md b/specs/threshold_inscription.md
index f4687f2b..371767b0 100644
--- a/specs/threshold_inscription.md
+++ b/specs/threshold_inscription.md
@@ -12,11 +12,27 @@
 **Devarim 6:9** — וּכְתַבְתָּם עַל מְזֻזֹת בֵּיתֶךָ וּבִשְׁעָרֶיךָ.
 *And you shall write them on the doorposts of your house and your gates.*
 
-**Devarim 11:20** — same verse, repeated. The doorpost-text verse is
-*identical* between the Shema's first paragraph (singular pole) and
-V'haya's second (oscillating pole). It is the only verse identical
-between the two paragraphs. The covenant frame oscillates; the
-threshold inscription does not.
+**Devarim 11:20** — the doorpost-text verse, near-identical between
+the Shema's first paragraph (singular pole, Devarim 6:9) and
+V'haya's second (oscillating pole, Devarim 11:20). The two verses
+are identical in pronunciation and meaning, but the Masoretic text
+preserves a one-letter difference in spelling: *mezuzot* is written
+**מזוזת** (chasser, defective) at Devarim 6:9 and **מזוזות** (male,
+plene) at Devarim 11:20.
+
+This drift correction is itself the discipline operating. The
+vehaya document (in chat downloads, outside the @spec_files set)
+described the verses as "identical"; an earlier version of this
+specification imported that claim verbatim; a Pass-6 audit against
+L1 caught the overstatement. The Masoretic plene/defective
+distinction IS significant — the system's own gilui_arayot halt
+rule defends ketiv/qere preservation, and would treat a collapse
+of male/chasser as a category-2 boundary violation. The threshold
+inscription is therefore NEAR-identical at the consonantal level
+and identical in function — not strictly identical at the text
+level. The covenant frame oscillates, the threshold inscription
+varies by one vav across paragraphs, the THRESHOLD INSCRIPTION'S
+FUNCTION (write the corporate text at every doorpost) does not.
 
 **Devarim 11:18** — וְשַׂמְתֶּם אֶת דְּבָרַי אֵלֶּה עַל לְבַבְכֶם.
 The corporate inscription (plural — *v'samtem … al l'vavkhem*) is
diff --git a/vav_pipeline/lib/vav_pipeline/doorpost.ex b/vav_pipeline/lib/vav_pipeline/doorpost.ex
index f8a489ff..64ccd599 100644
--- a/vav_pipeline/lib/vav_pipeline/doorpost.ex
+++ b/vav_pipeline/lib/vav_pipeline/doorpost.ex
@@ -3,12 +3,19 @@ defmodule VavPipeline.Doorpost do
   Category-grade specification identity verification — the doorpost
   text identity check.
 
-  Vehaya — Devarim 11:20: וּכְתַבְתָּם עַל־מְזֻזֹת בֵּיתֶךָ
-  וּבִשְׁעָרֶיךָ. The doorpost verse is identical between the
-  Shema's first paragraph (singular pole, Devarim 6:9) and V'haya's
-  second paragraph (oscillating, Devarim 11:13–21). The threshold
-  inscription is constant across paragraphs. The covenant frame
-  oscillates; what gets written at every threshold does not.
+  Vehaya — Devarim 11:20: וּכְתַבְתָּם עַל מְזוּזוֹת בֵּיתֶךָ
+  וּבִשְׁעָרֶיךָ. The doorpost-text verse appears near-identically
+  in the Shema's first paragraph (Devarim 6:9, singular pole) and
+  V'haya's second paragraph (Devarim 11:20, oscillating pole). The
+  two are identical in pronunciation and meaning; the Masoretic
+  text preserves a single-letter spelling difference (*mezuzot*
+  written **מזוזת** chasser at 6:9 vs. **מזוזות** male at 11:20).
+  See specs/threshold_inscription.md for why the precise reading
+  matters — the system's own gilui_arayot halt rule defends ketiv
+  preservation and would treat a male/chasser collapse as a
+  category-2 boundary violation. What is constant across paragraphs
+  is the FUNCTION (write the corporate text at every threshold),
+  not the consonantal text strictly.
 
   This module is the companion to `L1Reader.verify_integrity/0`.
   L1Reader defends the Torah scroll's identity (the SOURCE text).
@@ -163,7 +170,7 @@ defmodule VavPipeline.Doorpost do
   # changes; the update is a deliberate operator commit. A bare
   # hash-update commit (without a corresponding spec change in the
   # same commit) is itself a drift signal.
-  @expected_hash "5a73bc6ac8244c58446cf1d2a69dc01ccfe3ef1352d423ccbf2c29a6c8104be3"
+  @expected_hash "520c9799370d70d6e2e97b4be228c77efa63161c80bac75cf44fd5bb7bbd5549"
 
   @doc "Return the list of files that constitute the category-grade specification."
   @spec files() :: [String.t()]