diff --git a/docs/docs.json b/docs/docs.json
index 5e5ef1e9..e8050dfa 100644
--- a/docs/docs.json
+++ b/docs/docs.json
@@ -183,7 +183,6 @@
               "rfds/agent-telemetry-export",
               "rfds/proxy-chains",
               "rfds/mcp-over-acp",
-              "rfds/session-usage",
               "rfds/end-turn-token-usage",
               "rfds/auth-methods",
               "rfds/diff-delete",
@@ -210,7 +209,11 @@
           },
           {
             "group": "Preview",
-            "pages": ["rfds/rust-sdk-v1", "rfds/session-delete"]
+            "pages": [
+              "rfds/rust-sdk-v1",
+              "rfds/session-delete",
+              "rfds/session-usage"
+            ]
           },
           {
             "group": "Completed",
diff --git a/docs/rfds/session-usage.mdx b/docs/rfds/session-usage.mdx
index c2d7750e..f510330d 100644
--- a/docs/rfds/session-usage.mdx
+++ b/docs/rfds/session-usage.mdx
@@ -244,4 +244,5 @@ For agents that only provide usage during active prompting, the client UI may no
 - 2025-12-13: Changed from `session/status` request method to `session/update` notification with `sessionUpdate: "context_update"`. Made `cost` optional and removed `remaining` field (clients can compute as `size - used`). This approach provides more flexibility for agents and follows the same pattern as other dynamic session properties.
 - 2025-12-17: Renamed `reasoning_tokens` to `thought_tokens` for consistency with ACP terminology. Removed `percentage` field (clients can compute as `used / size * 100`).
 - 2025-12-19: Renamed `sessionUpdate: "context_update"` to `sessionUpdate: "usage_update"` to better reflect the payload semantics (includes both context window info and cumulative cost).
-- 2026-06-02: Split end-turn token accounting into a separate draft RFD and moved this context size and cost RFD toward Preview.
+- 2026-06-02: Split end-turn token accounting into a separate draft RFD.
+- 2026-06-03: Moved to Preview.
diff --git a/docs/rfds/updates.mdx b/docs/rfds/updates.mdx
index 5ffe318d..019ea42a 100644
--- a/docs/rfds/updates.mdx
+++ b/docs/rfds/updates.mdx
@@ -6,6 +6,13 @@ rss: true
 
 This page tracks lifecycle changes for ACP Requests for Dialog. For broader ACP announcements, see [Updates](/updates).
 
+<Update label="June 3, 2026" tags={["Preview"]}>
+## Session Usage RFD moves to Preview stage
+
+The RFD for adding `usage_update` session notifications for context window size and cumulative session cost has been moved to Preview stage. Please review the [RFD](/rfds/session-usage) for more information on the current proposal and provide feedback before the feature is stabilized.
+
+</Update>
+
 <Update label="June 2, 2026" tags={["Draft"]}>
 ## v2 Plan Variants RFD moves to Draft stage