diff --git a/.github/scaffold.json b/.github/scaffold.json
index c227d16..a78d5d5 100644
--- a/.github/scaffold.json
+++ b/.github/scaffold.json
@@ -1,6 +1,8 @@
 {
   "profile": "rust",
-  "addons": ["codecov"],
+  "addons": [
+    "codecov"
+  ],
   "placeholders": {
     "BINARY": "codegraph",
     "CRATE": "codegraph-rs",
diff --git a/.oxfmtignore b/.oxfmtignore
index c7a9319..a659ed9 100644
--- a/.oxfmtignore
+++ b/.oxfmtignore
@@ -1,10 +1,13 @@
 # oxfmt ignore — files oxfmt must NOT touch.
 #
 # Release-please owns changelog and manifest bytes; the general repository
-# formatter must not rewrite them between release PR updates.
+# formatter must not rewrite them between release PR updates. Its JSON
+# extra-file updater rewrites the whole of `.github/scaffold.json` (an inline
+# array comes back expanded), so oxfmt must leave that file to it as well.
 changelog/
 .release-please-manifest.json
 release-please-config.json
+.github/scaffold.json
 
 # Frozen/hash-addressed upstream-sync provenance. These bytes are reviewed and
 # verified by SHA rather than rewritten by the general Markdown formatter.