diff --git a/README.md b/README.md
index 4a78d72..195d5b4 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ an2 = p('Give an example', towhee_docs, [('Tell me something about Towhee', an1)
 
 Create the operator via the following factory method:
 
-***ops.prompt.template(temp)***
+***ops.prompt.template(temp, keys)***
 
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