diff --git a/docs/docs.json b/docs/docs.json
index 06abe1547..4fafcd0a7 100644
--- a/docs/docs.json
+++ b/docs/docs.json
@@ -212,7 +212,6 @@
             "group": "Active",
             "pages": [
               "rfds/streamable-http-websocket-transport",
-              "rfds/subagents",
               "rfds/mcp-over-acp",
               {
                 "group": "v2",
@@ -238,7 +237,7 @@
           },
           {
             "group": "Preview",
-            "pages": []
+            "pages": ["rfds/subagents"]
           },
           {
             "group": "Completed",
diff --git a/docs/rfds/subagents.mdx b/docs/rfds/subagents.mdx
index f2803013c..3c2edf202 100644
--- a/docs/rfds/subagents.mdx
+++ b/docs/rfds/subagents.mdx
@@ -1644,6 +1644,7 @@ important difference from a user-facing session.
 
 ## Revision history
 
+- 2026-11-12: Moved to Preview.
 - 2026-11-12: Clarified, from adapter implementation
   feedback, that an incoming view omits `senderSessionId` when the sender is
   not known, when an Agent links two views or leaves them unlinked, and when
diff --git a/docs/rfds/updates.mdx b/docs/rfds/updates.mdx
index df97009b8..56be88bf1 100644
--- a/docs/rfds/updates.mdx
+++ b/docs/rfds/updates.mdx
@@ -6,6 +6,15 @@ rss: true
 
 This page tracks lifecycle changes for ACP Requests for Dialog. For broader ACP announcements, see [Updates](/updates).
 
+<Update label="November 12, 2026" tags={["Preview"]}>
+## Subagent Sessions RFD moves to Preview stage
+
+The Subagent Sessions RFD has moved to Preview. The schema covers ACP v1 and
+v2. Please review the [RFD](/rfds/subagents), and provide Agent/Client interoperability feedback before
+stabilization.
+
+</Update>
+
 <Update label="November 6, 2026" tags={["Completed"]}>
 ## Client-Provided System Prompt RFD moves to Completed