diff --git a/documentation/ext_characters_preliminary_2.md b/documentation/ext_characters_preliminary_2.md
index a95e657..9b0f6cf 100644
--- a/documentation/ext_characters_preliminary_2.md
+++ b/documentation/ext_characters_preliminary_2.md
@@ -16,7 +16,7 @@
 
 ### 1.2 香港地区常用字
 
-> ☞ [字表来源](https://github.com/NightFurySL2001/cjktables/blob/master/hong_kong/hk-changyong.txt)
+> ☞ [字表来源](https://github.com/NightFurySL2001/cjktables/blob/master/hong_kong/hk-changyong.txt)，包含少量异体字。
 
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