diff --git a/.changeset/tricky-bugs-switch.md b/.changeset/tricky-bugs-switch.md
new file mode 100644
index 00000000..e2da36bc
--- /dev/null
+++ b/.changeset/tricky-bugs-switch.md
@@ -0,0 +1,5 @@
+---
+'@hono/zod-openapi': patch
+---
+
+expose `extendZodWithOpenApi` from `zod-to-openapi`
diff --git a/packages/zod-openapi/src/index.ts b/packages/zod-openapi/src/index.ts
index 7f74c455..3085c3c9 100644
--- a/packages/zod-openapi/src/index.ts
+++ b/packages/zod-openapi/src/index.ts
@@ -548,7 +548,7 @@ export const createRoute = <P extends string, R extends Omit<RouteConfig, 'path'
 }
 
 extendZodWithOpenApi(z)
-export { z }
+export { extendZodWithOpenApi, z }
 
 function addBasePathToDocument(document: Record<string, any>, basePath: string) {
   const updatedPaths: Record<string, any> = {}