diff --git a/engine/core/duplex_pipeline.py b/engine/core/duplex_pipeline.py
index 49c46c1..f90d7e6 100644
--- a/engine/core/duplex_pipeline.py
+++ b/engine/core/duplex_pipeline.py
@@ -692,6 +692,7 @@ class DuplexPipeline:
         if not text.strip() or self._interrupt_event.is_set():
             return
         
+        logger.info(f"[TTS] split sentence: {text!r}")
         try:
             is_first_chunk = True
             async for chunk in self.tts_service.synthesize_stream(text):