diff --git a/.zshrc b/.zshrc
new file mode 100644
index 00000000..e69de29b
diff --git a/client_test.go b/client_test.go
index 7119d8a7..3f27b9dd 100644
--- a/client_test.go
+++ b/client_test.go
@@ -340,7 +340,7 @@ func TestClientReturnsRequestBuilderErrors(t *testing.T) {
 			return client.CreateMessage(ctx, "", MessageRequest{})
 		}},
 		{"ListMessage", func() (any, error) {
-			return client.ListMessage(ctx, "", nil, nil, nil, nil)
+			return client.ListMessage(ctx, "", nil, nil, nil, nil, nil)
 		}},
 		{"RetrieveMessage", func() (any, error) {
 			return client.RetrieveMessage(ctx, "", "")
diff --git a/messages.go b/messages.go
index 1fddd631..eefc29a3 100644
--- a/messages.go
+++ b/messages.go
@@ -100,6 +100,7 @@ func (c *Client) ListMessage(ctx context.Context, threadID string,
 	order *string,
 	after *string,
 	before *string,
+	runID *string,
 ) (messages MessagesList, err error) {
 	urlValues := url.Values{}
 	if limit != nil {
@@ -114,6 +115,10 @@ func (c *Client) ListMessage(ctx context.Context, threadID string,
 	if before != nil {
 		urlValues.Add("before", *before)
 	}
+	if runID != nil {
+		urlValues.Add("run_id", *runID)
+	}
+
 	encodedValues := ""
 	if len(urlValues) > 0 {
 		encodedValues = "?" + urlValues.Encode()
diff --git a/messages_test.go b/messages_test.go
index 71ceb4d3..b25755f9 100644
--- a/messages_test.go
+++ b/messages_test.go
@@ -208,7 +208,7 @@ func TestMessages(t *testing.T) {
 	}
 
 	var msgs openai.MessagesList
-	msgs, err = client.ListMessage(ctx, threadID, nil, nil, nil, nil)
+	msgs, err = client.ListMessage(ctx, threadID, nil, nil, nil, nil, nil)
 	checks.NoError(t, err, "ListMessages error")
 	if len(msgs.Messages) != 1 {
 		t.Fatalf("unexpected length of fetched messages")
@@ -219,7 +219,8 @@ func TestMessages(t *testing.T) {
 	order := "desc"
 	after := "obj_foo"
 	before := "obj_bar"
-	msgs, err = client.ListMessage(ctx, threadID, &limit, &order, &after, &before)
+	runID := "run_abc123"
+	msgs, err = client.ListMessage(ctx, threadID, &limit, &order, &after, &before, &runID)
 	checks.NoError(t, err, "ListMessages error")
 	if len(msgs.Messages) != 1 {
 		t.Fatalf("unexpected length of fetched messages")