diff --git a/README.md b/README.md
index 762944f..33625f9 100644
--- a/README.md
+++ b/README.md
@@ -61,6 +61,13 @@ Note, if you are using third party service, you need to `export OPENAI_API_BASE=
 2. export TOGETHER_API_KEY=${the_key}
 3. use `qwen_pro: ${message}` to ask
 
+## Bot -> dify
+
+1. visit https://cloud.dify.ai/ get selected Chatbot's API Secret key
+2. export DIFY_API_KEY=${the_key}
+3. use `dify: ${message}` to ask
+
+Note, currently its support dify Chatbot with instructions(System prompt) and different MODEL with its parameters.
 
 ## HOW TO Install and Run
 
diff --git a/handlers/dify.py b/handlers/dify.py
index 058a058..7cbd6ac 100644
--- a/handlers/dify.py
+++ b/handlers/dify.py
@@ -23,7 +23,7 @@ if DIFY_API_KEY:
 
 # Global history cache
 dify_player_dict = {}
-dify_player_c = {}
+dify_player_c = {} # History cache is supported by dify cloud conversation_id.
 
 
 def dify_handler(message: Message, bot: TeleBot) -> None: