bold

Author: dsp-ant

docs/specification/2025-06-18/changelog.mdx

@@ -28,7 +28,7 @@ the previous revision, [2025-03-26](/specification/2025-03-26).
    tool call results. (PR [#603](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/603))
 8. Require [negotiated protocol version to be specified](/specification/2025-06-18/basic/transports#protocol-version-header)
    via `MCP-Protocol-Version` header in subsequent requests when using HTTP (PR [#548](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/548)).
-9. Change _SHOULD_ to _MUST_ in [Lifecycle Operation](/specification/2025-06-18/basic/lifecycle#operation)
+9. Change **SHOULD** to **MUST** in [Lifecycle Operation](/specification/2025-06-18/basic/lifecycle#operation)
 
 ## Other schema changes