Add note about Placeholder coercion

jackmpcollins · Jan 6, 2025 · b443e09 · b443e09
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commit b443e09
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/vision.md b/docs/vision.md
@@ -52,7 +52,7 @@ For more info on the `@chatprompt` decorator, see [Chat Prompting](chat-promptin
 
 ## Placeholder
 
-In the previous example, the image url was tied to the function. To provide the image as a function parameter, use `Placeholder`. This substitutes a function argument into the message when the function is called.
+In the previous example, the image url was tied to the function. To provide the image as a function parameter, use `Placeholder`. This substitutes a function argument into the message when the function is called. The placeholder will also automatically coerce the argument to the correct type if possible, for example `str` to `ImageUrl`.
 
 ```python hl_lines="10"
 from magentic import chatprompt, ImageUrl, Placeholder, UserMessage