diff --git a/src/server/sse.ts b/src/server/sse.ts
index 1bc304a8..84c1cbb9 100644
--- a/src/server/sse.ts
+++ b/src/server/sse.ts
@@ -136,6 +136,8 @@ export class SSEServerTransport implements Transport {
 
   /**
    * Returns the session ID for this transport.
+   *
+   * This can be used to route incoming POST requests.
    */
   get sessionId(): string {
     return this._sessionId;