diff --git a/README.md b/README.md
index 89259f3..e73a28c 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ The **distributed Interdependency textbook** is a separate technical reading seq
 
 | Chapter | Title | Source |
 |---:|---|---|
-| 0 | Meta Energy Theory — Axioms, Postulates, and Theorems | `The-Interdependency/metapat:CHAPTER_ZERO.md` |
+| 0 | Meta Energy Theory — Root Structure and Action | `The-Interdependency/metapat:CHAPTER_ZERO.md` |
 | 1 | The Subtractive Foundations of the Unit Carrier | `The-Interdependency/ucns:docs/chapter-1.md` |
 | 2 | Measurement Without Transfer | `The-Interdependency/edcm:docs/chapter-2.md` |
 | 3 | Modules That Speak for Themselves | `The-Interdependency/skill-lib:docs/chapter-3.md` |
diff --git a/src/_data/textbook_sources.json b/src/_data/textbook_sources.json
index ef1addf..7a788d5 100644
--- a/src/_data/textbook_sources.json
+++ b/src/_data/textbook_sources.json
@@ -3,7 +3,7 @@
     "number": 0,
     "display_number": "Zero",
     "slug": "chapter-zero",
-    "title": "Meta Energy Theory — Axioms, Postulates, and Theorems",
+    "title": "Meta Energy Theory — Root Structure and Action",
     "repository": "The-Interdependency/metapat",
     "path": "CHAPTER_ZERO.md",
     "branch": "main",
@@ -12,7 +12,7 @@
     "license_status": "declared",
     "correction_target": "The-Interdependency/metapat:CHAPTER_ZERO.md",
     "status": "root ontology and theory",
-    "summary": "The invariant vocabulary of distinction, boundary, simplex, tensor, energy-state, registration, and question."
+    "summary": "The root structure/action model: thing, boundary, state, simplex, relate, emerge, tensor, vector, scalar, transformation, time, and derived energy."
   },
   {
     "number": 1,
diff --git a/tests/textbook-integrity.test.mjs b/tests/textbook-integrity.test.mjs
index 0f1ff4a..0a288b7 100644
--- a/tests/textbook-integrity.test.mjs
+++ b/tests/textbook-integrity.test.mjs
@@ -6,7 +6,7 @@ import assert from 'node:assert/strict';
 import { readFile } from 'node:fs/promises';
 
 const expected = [
-  [0, 'chapter-zero', 'Meta Energy Theory — Axioms, Postulates, and Theorems', 'The-Interdependency/metapat', 'CHAPTER_ZERO.md'],
+  [0, 'chapter-zero', 'Meta Energy Theory — Root Structure and Action', 'The-Interdependency/metapat', 'CHAPTER_ZERO.md'],
   [1, 'chapter-one', 'The Subtractive Foundations of the Unit Carrier', 'The-Interdependency/ucns', 'docs/chapter-1.md'],
   [2, 'chapter-two', 'Measurement Without Transfer', 'The-Interdependency/edcm', 'docs/chapter-2.md'],
   [3, 'chapter-three', 'Modules That Speak for Themselves', 'The-Interdependency/skill-lib', 'docs/chapter-3.md'],