docs: Update README.md

Author: sokoliva

docs/migrations/v1_0/README.md

@@ -4,7 +4,7 @@ The `a2a-sdk` has achieved a major milestone in stability and reliability with t
 
 Beyond protocol support, `v1.0` enhances the developer experience by introducing unified helper utilities for easier object creation and adopting Starlette route factory functions for more flexible server configuration.
 
-This documentation details the technical upgrades and architectural modifications introduced in A2A Python SDK v1.0; For developers using the database persistence layer, please refer to the [Database Migration Guide](database/) for specific update instructions.
+This documentation details the technical upgrades and architectural modifications introduced in A2A Python SDK v1.0. For developers using the database persistence layer, please refer to the [Database Migration Guide](database/) for specific update instructions.
 
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@@ -81,6 +81,8 @@ This affects every enum in the SDK: `TaskState`, `Role`.
 
 ### Message and Part construction
 
+Constructing messages is simplified in v1.0. The old API required wrapping content in an intermediate type (`TextPart`, `FilePart`, `DataPart`) before placing it inside a `Part`. In v1.0, `Part` is a single unified message — set the content type directly on it and the wrapper types are gone entirely.
+
 Key differences:
 - `Part(TextPart(text=...))` → `Part(text=...)` (flat union field)
 - `Role.user` → `Role.ROLE_USER`, `Role.agent` → `Role.ROLE_AGENT`