diff --git a/docs/mcp.md b/docs/mcp.md
index 142dd27..08a17ff 100644
--- a/docs/mcp.md
+++ b/docs/mcp.md
@@ -56,6 +56,9 @@ refused unless `--allow-origin` names it.
   scope; docs/credential-broker.md). They reach each tool call as `STOREBOUND_PROFILE_<NAME>_*` env, held in memory for
   10 minutes and never written. A project picks its profile as usual (the config's `account`).
 - `project` may also be a folder name under the roots (a shared server keeps its checkouts there).
+- Long calls: a `tools/call` whose request accepts `text/event-stream` is answered as SSE, with a comment line every
+  20 s until the result arrives as one `message` event, so a proxy that cuts silent responses (Cloudflare: 100 s)
+  keeps the connection. Other requests get plain JSON.
 - Long calls: a `tools/call` whose request accepts `text/event-stream` is answered as SSE, with a comment line every
   20 s until the result arrives as one `message` event, so a proxy that cuts silent responses (Cloudflare: 100 s)
   keeps the connection. Other requests get plain JSON.