diff --git a/paddlespeech/t2s/frontend/phonectic.py b/paddlespeech/t2s/frontend/phonectic.py
index b55c5b5c275c366d4a3e91f2e28330866ddf1460..7ec821ed5e5000c81aac715279d687010a02d82b 100644
--- a/paddlespeech/t2s/frontend/phonectic.py
+++ b/paddlespeech/t2s/frontend/phonectic.py
@@ -100,7 +100,6 @@ class English(Phonetics):
                 for phn in phones
             ]
             if len(phones) != 0:
-                # replace unk phone with sp
                 phones_list.append(phones)
 
         if merge_sentences: