diff --git a/src/launcher/batcher.rs b/src/launcher/batcher.rs
index 9c040fa..c30b682 100644
--- a/src/launcher/batcher.rs
+++ b/src/launcher/batcher.rs
@@ -284,7 +284,7 @@ where
 
     /// Merges UI context data into the rendering buffer.
     ///
-    /// This asynchronous function accepts two buffers:
+    /// This synchronous function accepts two buffers:
     /// - `buf`: A mutable reference to a `Buffer<(UIContext, usize)>` used for UI rendering.
     /// - `from`: A `Buffer<usize>` produced by `prepare` containing corresponding indices.
     ///
@@ -296,7 +296,7 @@ where
     /// Both the preparation and merge operations are relatively time-consuming. To minimize rendering delays,
     /// it is recommended that the preparation and rendering processes are executed concurrently (for example, in separate
     /// threads or processes), while the merge operation should be performed in a synchronized manner.
-    pub async fn merge(
+    pub fn merge(
         &mut self,
         buf: &mut Buffer<(UIContext, usize)>,
         mut from: Buffer<usize>,
diff --git a/tests/dummyui.rs b/tests/dummyui.rs
index c076050..e4cedb1 100644
--- a/tests/dummyui.rs
+++ b/tests/dummyui.rs
@@ -46,7 +46,7 @@ where
 
         while more {
             let from = batcher.prepare().await;
-            more = batcher.merge(&mut buf, from).await?;
+            more = batcher.merge(&mut buf, from)?;
         }
 
         let mut pos = Position::default();