diff --git a/CHANGELOG.md b/CHANGELOG.md
index a8b750c..b73f924 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Breaking:** `AwaitOperationConfiguration` cases are prefixed with `Await` (`AwaitSequential`, `AwaitParallel 4`, ...) so they no longer collide with `System.Threading.Tasks.Parallel`
 - **Breaking:** the `Async` functions raise the original exception instead of an `AggregateException`, and a cancelled operation cancels the computation instead of failing it
 - **Breaking:** the `Async` `toLookup` overloads no longer take a `cancellationToken`; they observe the token of the computation
+- **Breaking:** `ofTask` defaults `configureAwait` to `true`, like R3 and `ofAsync`
 - **Breaking:** the `OptionExtensions`/`ValueOptionExtensions` types are replaced by `Observable.choose`, which takes a `voption` chooser, and `ObservableOption.choose` for `option`; the `Observable.Extensions` type is replaced by `Observable.ofSeq`
 - **Breaking:** after `open FSharp.Control.R3`, `Observable.choose` is the R3 function, like `Observable.map` and `Observable.filter` already were; use `Microsoft.FSharp.Control.Observable.choose` for `IObservable` and F# events
 - **Breaking:** after `open FSharp.Control.R3`, the bare type name `Observable` refers to `FSharp.Control.R3.ObservableFactories.Observable`; write `open type R3.Observable` and extend `R3.Observable` by its full name
diff --git a/src/FSharp.Control.R3/TaskObservable.fs b/src/FSharp.Control.R3/TaskObservable.fs
index 122d55f..ca77f4f 100644
--- a/src/FSharp.Control.R3/TaskObservable.fs
+++ b/src/FSharp.Control.R3/TaskObservable.fs
@@ -114,15 +114,29 @@ module Extensions =
     type Observable private () =
 
         /// <summary>
-        /// Creates observable sequence from a single element returned by cancellable <see cref="ValueTask"/>
+        /// Creates an observable sequence that invokes the factory on every subscription, emits <see cref="F:R3.Unit.Default"/>
+        /// when its <see cref="T:System.Threading.Tasks.ValueTask"/> completes, and then completes.
+        /// <para>
+        /// Disposing the subscription cancels the token passed to the factory. A failure of the task completes the sequence
+        /// with that failure. <paramref name="configureAwait"/> (true by default) defines whether the continuation
+        /// resumes on the captured synchronization context.
+        /// </para>
         /// </summary>
-        static member inline ofTask (asyncFactory : CancellationToken -> ValueTask, [<Optional>] configureAwait) =
+        static member inline ofTask (asyncFactory : CancellationToken -> ValueTask, [<Optional; DefaultParameterValue(true)>] configureAwait : bool) =
             Observable.FromAsync (asyncFactory, configureAwait)
 
         /// <summary>
-        /// Creates observable sequence from a single element returned by cancellable <see cref="ValueTask"/>
+        /// Creates an observable sequence that invokes the factory on every subscription, emits the result of its
+        /// <see cref="T:System.Threading.Tasks.ValueTask`1"/>, and then completes.
+        /// <para>
+        /// Disposing the subscription cancels the token passed to the factory. A failure of the task completes the sequence
+        /// with that failure. <paramref name="configureAwait"/> (true by default) defines whether the continuation
+        /// resumes on the captured synchronization context.
+        /// </para>
         /// </summary>
-        static member inline ofTask (asyncFactory : CancellationToken -> ValueTask<'T>, [<Optional>] configureAwait) =
+        static member inline ofTask
+            (asyncFactory : CancellationToken -> ValueTask<'T>, [<Optional; DefaultParameterValue(true)>] configureAwait : bool)
+            =
             Observable.FromAsync (asyncFactory, configureAwait)
 
         static member inline toArray (source, [<Optional>] cancellationToken) = ObservableExtensions.ToArrayAsync (source, cancellationToken)