diff --git a/core/client.go b/core/client.go
index 5f63781e4..2e086edd3 100644
--- a/core/client.go
+++ b/core/client.go
@@ -254,6 +254,7 @@ func (c *Client) handshakeWithDefinition(hf *frame.HandshakeFrame) error {
 	if functionDefinition == nil {
 		return nil
 	}
+	c.Logger.Info("register function definition", "functionDefinition", string(functionDefinition))
 	hf.FunctionDefinition = functionDefinition
 	return nil
 }