diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4dc8b33..e4113ca 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,8 @@ jobs:
         python-version: ["3.11", "3.12"]
         os:
           - windows-latest
-          - macos-13      # Intel — see docs/release.md for the retirement transition plan.
+          # GitHub has retired the macos-13 (Intel) hosted runners, so CI is
+          # Apple Silicon only; Intel coverage is manual (see docs/release.md).
           - macos-14      # Apple Silicon
           - ubuntu-latest
 
diff --git a/docs/release.md b/docs/release.md
index 79413d0..8b78cb8 100644
--- a/docs/release.md
+++ b/docs/release.md
@@ -81,12 +81,18 @@ Unsigned builds are acceptable for early releases (spec §12).
 
 ## Manual Intel Mac test plan
 
-CI currently includes `macos-13` (Intel). When GitHub announces its
-deprecation, CI transitions to Apple Silicon only and Intel coverage moves to
-the manual test plan below. **Do not act on this until GitHub announces the
-deprecation** (spec §12).
-
-<!-- TODO: manual Intel Mac test steps. -->
+GitHub has retired the `macos-13` (Intel) hosted runners, so CI now runs on
+Apple Silicon (`macos-14`) only. Those jobs sat queued indefinitely waiting
+for an Intel runner that no longer exists, so they were dropped from the
+matrix (spec §12). Intel-Mac coverage is therefore manual, run on an Intel Mac
+before a release:
+
+1. Create a clean virtual environment and install per the **Linux/macOS**
+   steps in `docs/developer.md` (numpy first, then PyNEC with
+   `--no-build-isolation`).
+2. Run the test suite: `QT_QPA_PLATFORM=offscreen pytest`.
+3. Launch the app, solve a dipole, and export a build sheet — confirming the
+   PySide6 UI, the PyNEC build, and the PDF backend all work on Intel.
 
 ## Release checklist