diff --git a/gemini_docs/README.md b/gemini_docs/README.md
index 828bfc84f2..e7ac132fac 100644
--- a/gemini_docs/README.md
+++ b/gemini_docs/README.md
@@ -137,6 +137,8 @@ print(chat.send_message(
 
 #### Automatic Function calling
 
+Note: The `FunctionDeclaration.from_func` converter does not support nested types for parameters. Please provide full `FunctionDeclaration` instead.
+
 ```python
 from vertexai.preview.generative_models import GenerativeModel, Tool, FunctionDeclaration, AutomaticFunctionCallingResponder