diff --git a/README.md b/README.md
index 0d67470..142150d 100644
--- a/README.md
+++ b/README.md
@@ -84,7 +84,7 @@ dotnet add package Microsoft.Data.Sqlite
 | `Open.Database.Extensions.SqlClient` | The same API on the older `System.Data.SqlClient`. Deprecated: use `MSSqlClient`. |
 | `Open.Database.Extensions` | Discontinued. It only referenced Core: use `Open.Database.Extensions.Core`. The last published version is 9.0.3. |
 
-Targets: `netstandard2.0`, `netstandard2.1` and `net10.0` (`MSSqlClient`: `net472` and `net10.0`). Version 11 is a release candidate (`11.0.0-rc.3`): see [What's new in 11](https://open-net-libraries.github.io/Open.Database.Extensions/articles/whats-new-11.html) for the changes, the breaking changes and the known limitations, and the [release notes](https://open-net-libraries.github.io/Open.Database.Extensions/articles/release-notes.html) for earlier versions. Please try it and tell us what you find.
+Targets: `netstandard2.0`, `netstandard2.1` and `net10.0` (`MSSqlClient`: `net472` and `net10.0`). Version 11 is a release candidate (`11.0.0-rc.4`): see [What's new in 11](https://open-net-libraries.github.io/Open.Database.Extensions/articles/whats-new-11.html) for the changes, the breaking changes and the known limitations, and the [release notes](https://open-net-libraries.github.io/Open.Database.Extensions/articles/release-notes.html) for earlier versions. Please try it and tell us what you find.
 
 ## How it fits together
 
diff --git a/Source/Directory.Build.props b/Source/Directory.Build.props
index bdb430e..9bafb36 100644
--- a/Source/Directory.Build.props
+++ b/Source/Directory.Build.props
@@ -6,7 +6,7 @@
 		<VersionPrefix>11.0.0</VersionPrefix>
 		<VersionSuffix Condition="'$(Configuration)' == 'Debug'">debug</VersionSuffix>
 		<!-- Release candidate line: delete this element (or pass -p:VersionSuffix=) to build the stable 11.0.0 packages. -->
-		<VersionSuffix Condition="'$(Configuration)' != 'Debug'">rc.3</VersionSuffix>
+		<VersionSuffix Condition="'$(Configuration)' != 'Debug'">rc.4</VersionSuffix>
 
 		<!-- net10.0 is the primary/modern target. netstandard2.0/2.1 are retained as shimmed
 		     legacy paths (via #if switching + BCL compat packages). net472 lives only on the
diff --git a/docsite/articles/whats-new-11.md b/docsite/articles/whats-new-11.md
index 437f10f..81b9063 100644
--- a/docsite/articles/whats-new-11.md
+++ b/docsite/articles/whats-new-11.md
@@ -1,7 +1,7 @@
 # What's new in 11
 
 > [!NOTE]
-> This is `11.0.0-rc.3`, a release candidate. The API is settled. Please try it and report what you find.
+> This is `11.0.0-rc.4`, a release candidate. The API is settled. Please try it and report what you find.
 
 Version 11 is a performance release and a tidy-up release. Result mapping is rewritten around a cached, typed row reader, column mapping is declared once, NULL and error handling follow simple rules, and stored-procedure parameters can be named from the arguments you already have. See [Performance](performance.md) for what the speed-up does and does not buy you. Coming from 10.x? Read "Upgrading from 10.x" below first.
 
@@ -14,11 +14,14 @@ Rebuild consumers of rc.3. Both changes are source-compatible for every call exc
 
 ## Changes since rc.3
 
-- `table.Map<T>()` maps a DataTable you already have (a `MappedTable<T>`; each terminal reads through its own DataTableReader).
+- The asynchronous terminals on a command take the element type: `await command.ToArrayAsync<int>(cancellationToken)` is `Map<int>()` then the terminal. `Map<T>()` of a single value such as `int` reads the first column.
 - `reader.Map<T>()` and `command.Map<T>()` map a plain `IDataReader` or `IDbCommand` with the same terminals as an expressive command's `Map<T>()`. The reader is never opened, closed, disposed or advanced to the next result set; a command opens and closes only the connection it opened. See [Mapping a reader or a command you already have](mapping.md#mapping-a-reader-or-a-command-you-already-have).
+- `table.Map<T>()` maps a DataTable you already have (a `MappedTable<T>`; each terminal reads through its own DataTableReader).
 - A null `RowMap<T>` passed to `Map<T>(map)` no longer throws `ArgumentNullException`: it maps exactly as `Map<T>()` does (a single value reads the first column).
 - A type of your own that implements both `IExecuteReader` and `IDbCommand` (or `IDataReader`) now gets an ambiguous `Map` call (CS0121); cast it to the interface you mean.
 - A `default` `MappedQuery<T>` (or `MappedQueryWithSkip<T>`, `MappedQueryWithTake<T>`) now throws `InvalidOperationException` when used, where it threw `NullReferenceException`.
+- Members with a better route are marked `[Obsolete]`. Each message names the replacement, and they are removed in 12. They are warnings, never errors, but a build that treats warnings as errors stops on them until you move to the replacement or suppress `CS0618`. See [Deprecated in 11.0](#deprecated-in-110).
+- The asynchronous command paths dispose their reader with `ConfigureAwait(false)` on `netstandard2.1` and `net10.0`.
 - The `Map<T>` documentation now says how columns match by default: exactly, else ignoring case, else ignoring case and underscores (`author_id` feeds `AuthorId`).
 
 ## Changes since rc.2