diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b32db0..72c34ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- Clarify that `direction` is optional
+
 ## [v1.0.0] - 2023-09-28
 
 ### Changed
diff --git a/openapi.yaml b/openapi.yaml
index c7cb2b1..e32fbe1 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -47,7 +47,6 @@ components:
         type: object
         required:
           - field
-          - direction
         properties:
           field:
             type: string