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diff --git a/release-notes/7.0/preview/api-diff/preview7/Microsoft.NETCore.App/7.0-preview7_System.Threading.Tasks.Dataflow.md b/release-notes/7.0/preview/api-diff/preview7/Microsoft.NETCore.App/7.0-preview7_System.Threading.Tasks.Dataflow.md
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+++ b/release-notes/7.0/preview/api-diff/preview7/Microsoft.NETCore.App/7.0-preview7_System.Threading.Tasks.Dataflow.md
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+# System.Threading.Tasks.Dataflow
+
+``` diff
+ namespace System.Threading.Tasks.Dataflow {
+     [NullableAttribute((byte)0)]
+     [NullableContextAttribute((byte)1)]
+     public sealed class TransformManyBlock<TInput, TOutput> : IDataflowBlock, IPropagatorBlock<TInput, TOutput>, IReceivableSourceBlock<TOutput>, ISourceBlock<TOutput>, ITargetBlock<TInput> {
++        public TransformManyBlock(Func<TInput, IAsyncEnumerable<TOutput>> transform);
++        public TransformManyBlock(Func<TInput, IAsyncEnumerable<TOutput>> transform, ExecutionDataflowBlockOptions dataflowBlockOptions);
+     }
+ }
+```
+