diff --git a/.changeset/cold-panthers-guess.md b/.changeset/cold-panthers-guess.md
new file mode 100644
index 00000000..45abc110
--- /dev/null
+++ b/.changeset/cold-panthers-guess.md
@@ -0,0 +1,5 @@
+---
+'@hono/effect-validator': patch
+---
+
+fix: add a build command to `package.json` at the top
diff --git a/package.json b/package.json
index 26fc8658..8360c25e 100644
--- a/package.json
+++ b/package.json
@@ -33,6 +33,7 @@
     "build:oidc-auth": "yarn workspace @hono/oidc-auth build",
     "build:node-ws": "yarn workspace @hono/node-ws build",
     "build:react-compat": "yarn workspace @hono/react-compat build",
+    "build:effect-validator": "yarn workspace @hono/effect-validator build",
     "build": "run-p 'build:*'",
     "lint": "eslint 'packages/**/*.{ts,tsx}'",
     "lint:fix": "eslint --fix 'packages/**/*.{ts,tsx}'",
@@ -64,4 +65,4 @@
     "typescript": "^5.2.2"
   },
   "packageManager": "yarn@4.0.2"
-}
+}
\ No newline at end of file