diff --git a/src/connector/src/source/base.rs b/src/connector/src/source/base.rs
index 269cc4f037e95..a4996eabbf82e 100644
--- a/src/connector/src/source/base.rs
+++ b/src/connector/src/source/base.rs
@@ -316,6 +316,7 @@ pub fn extract_source_struct(info: &PbStreamSourceInfo) -> Result<SourceStruct>
 /// Stream of [`SourceMessage`].
 pub type BoxSourceStream = BoxStream<'static, crate::error::ConnectorResult<Vec<SourceMessage>>>;
 
+// Manually expand the trait alias to improve IDE experience.
 pub trait ChunkSourceStream:
     Stream<Item = crate::error::ConnectorResult<StreamChunk>> + Send + 'static
 {