diff --git a/CHANGELOG.md b/CHANGELOG.md
index ea785af0c2..df259927c4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,10 +10,11 @@ and this project adheres to
 
 - @cosmjs/stargate: Add `makeMultisignedTxBytes` which is like
   `makeMultisignedTx` but returns bytes ready to broadcast ([#1176]).
-- @cosmjs/tendermint-rpc: Add Tendermint 0.35 client. This is currently not used
-  by higher level clients as Cosmos SDK 0.42-0.46 use Tendermint 0.34. But it
-  can be used as a standalone client for a Tendermint 0.35 RPC endpoint.
-  ([[#1154]])
+- @cosmjs/tendermint-rpc: Add Tendermint 0.35 client (private, unusable). This
+  is currently not used by higher level clients as Cosmos SDK 0.42-0.46 use
+  Tendermint 0.34. It may become public or evolve into a Tendermint 0.36+ client
+  from here. If you need this client, please comment in [#1225] or open a new
+  issue. ([#1154] and [#1225])
 - @cosmjs/tendermint-rpc: Add fields `codespace` and `info` to
   `AbciQueryResponse`.
 - @cosmjs/cosmwasm-stargate: Add `SigningCosmWasmClient.executeMultiple`
@@ -27,6 +28,7 @@ and this project adheres to
 [#1154]: https://github.com/cosmos/cosmjs/issues/1154
 [#1176]: https://github.com/cosmos/cosmjs/pull/1176
 [#1224]: https://github.com/cosmos/cosmjs/pull/1224
+[#1225]: https://github.com/cosmos/cosmjs/issues/1225
 
 ### Fixed
 
diff --git a/packages/tendermint-rpc/src/index.ts b/packages/tendermint-rpc/src/index.ts
index 94f2d7e01d..8e307862fe 100644
--- a/packages/tendermint-rpc/src/index.ts
+++ b/packages/tendermint-rpc/src/index.ts
@@ -89,8 +89,10 @@ export {
 } from "./tendermint34";
 export * as tendermint34 from "./tendermint34";
 export { Tendermint34Client } from "./tendermint34";
-export * as tendermint35 from "./tendermint35";
-export { Tendermint35Client } from "./tendermint35";
+// Tendermint 0.35 support is not public. The implementation may break or be removed at any point in time.
+// See https://github.com/cosmos/cosmjs/issues/1225 for more context.
+// export * as tendermint35 from "./tendermint35";
+// export { Tendermint35Client } from "./tendermint35";
 export {
   BlockIdFlag,
   CommitSignature,
diff --git a/packages/tendermint-rpc/src/tendermint35/tendermint35client.ts b/packages/tendermint-rpc/src/tendermint35/tendermint35client.ts
index afa2d4af79..108966203e 100644
--- a/packages/tendermint-rpc/src/tendermint35/tendermint35client.ts
+++ b/packages/tendermint-rpc/src/tendermint35/tendermint35client.ts
@@ -14,6 +14,11 @@ import { adaptor35, Decoder, Encoder, Params, Responses } from "./adaptor";
 import * as requests from "./requests";
 import * as responses from "./responses";
 
+/**
+ * Please note the Tendermint 0.35 client is currently not exported and may break or be removed at any point in time.
+ *
+ * @see https://github.com/cosmos/cosmjs/issues/1225
+ */
 export class Tendermint35Client {
   /**
    * Creates a new Tendermint client for the given endpoint.