diff --git a/src/domain/referenceSourceClassification.test.ts b/src/domain/referenceSourceClassification.test.ts
new file mode 100644
index 000000000..35398983b
--- /dev/null
+++ b/src/domain/referenceSourceClassification.test.ts
@@ -0,0 +1,37 @@
+import { describe, expect, it } from "vitest";
+
+import { classifyReferenceSourcePath } from "./referenceSourceClassification.js";
+
+describe("reference source manifest filenames", () => {
+  it.each(["CMakeLists.txt", "cmakelists.txt", "CMAKELISTS.TXT"])(
+    "recognizes %s with the existing case-insensitive policy",
+    (path) => {
+      expect(classifyReferenceSourcePath(path)).toEqual([
+        "documentation",
+        "manifest",
+      ]);
+    },
+  );
+
+  it("preserves secondary classifications for a nested CMake manifest", () => {
+    expect(classifyReferenceSourcePath("src/CMakeLists.txt")).toEqual([
+      "documentation",
+      "manifest",
+      "source",
+    ]);
+  });
+
+  it.each(["CMakeLists.txt.backup", "CMakeList.txt", "notes.txt"])(
+    "does not classify the near-match %s as a manifest",
+    (path) => {
+      expect(classifyReferenceSourcePath(path)).not.toContain("manifest");
+    },
+  );
+
+  it.each(["package.json", "PACKAGE.JSON", "Cargo.toml"])(
+    "preserves case-insensitive recognition of %s",
+    (path) => {
+      expect(classifyReferenceSourcePath(path)).toContain("manifest");
+    },
+  );
+});
diff --git a/src/domain/referenceSourceClassification.ts b/src/domain/referenceSourceClassification.ts
index 8246e6ccf..c567cf06a 100644
--- a/src/domain/referenceSourceClassification.ts
+++ b/src/domain/referenceSourceClassification.ts
@@ -108,7 +108,7 @@ const MANIFEST_FILENAMES = new Set([
   "pipfile.lock",
   "setup.cfg",
   "manifest.in",
-  "CMakeLists.txt",
+  "cmakelists.txt",
   "meson.build",
   "configure",
   "configure.ac",
diff --git a/tests/boundary/filesystem/referenceSourceImport.test.ts b/tests/boundary/filesystem/referenceSourceImport.test.ts
index 2c6d5d13f..0b6864d26 100644
--- a/tests/boundary/filesystem/referenceSourceImport.test.ts
+++ b/tests/boundary/filesystem/referenceSourceImport.test.ts
@@ -136,6 +136,41 @@ describe("reference source symlink import", () => {
   });
 });
 
+describe("reference source manifest inventory", () => {
+  it("retains CMake build manifests in the imported inventory", async () => {
+    const root = await createTestTempDirectory("rea-reference-cmake-");
+    await mkdir(join(root, "src"));
+    await Promise.all([
+      writeFile(join(root, "CMakeLists.txt"), "project(example)\n"),
+      writeFile(
+        join(root, "src", "CMakeLists.txt"),
+        "add_library(example main.cpp)\n",
+      ),
+      writeFile(join(root, "notes.txt"), "Build notes.\n"),
+    ]);
+
+    const result = await importTree(root);
+    expect(result.ok).toBe(true);
+    if (!result.ok) return;
+    expect(result.value.manifests).toEqual([
+      "CMakeLists.txt",
+      "src/CMakeLists.txt",
+    ]);
+    expect(result.value.entries).toContainEqual(
+      expect.objectContaining({
+        path: "CMakeLists.txt",
+        classifications: ["documentation", "manifest"],
+      }),
+    );
+    expect(result.value.entries).toContainEqual(
+      expect.objectContaining({
+        path: "src/CMakeLists.txt",
+        classifications: ["documentation", "manifest", "source"],
+      }),
+    );
+  });
+});
+
 describe("reference source import behavior", () => {
   // The importer declares no byte ceiling and no entry-count ceiling. Scale
   // independence cannot be asserted as a relationship over a bounded fixture,