diff --git a/scripts/build-data.ts b/scripts/build-data.ts
index df43857..f3e389e 100644
--- a/scripts/build-data.ts
+++ b/scripts/build-data.ts
@@ -12,6 +12,7 @@
  */
 import { mkdir, readFile, writeFile } from 'node:fs/promises'
 import { join } from 'node:path'
+import { format, resolveConfig } from 'prettier'
 import { parseCMap, partitionSignature } from './cmap.ts'
 import {
   DATA_DIR,
@@ -619,6 +620,13 @@ await writeFile(
     `<!-- sources:start -->\n${table}\n<!-- sources:end -->`,
   ),
 )
+await writeFile(
+  readmePath,
+  await format(await readFile(readmePath, 'utf8'), {
+    ...(await resolveConfig(readmePath)),
+    filepath: readmePath,
+  }),
+)
 
 const tally = (counts: Record<string, number>) =>
   Object.entries(counts)