diff --git a/src/DotNet/MethodDef.cs b/src/DotNet/MethodDef.cs
index 1411eb1a..6fe8a88b 100644
--- a/src/DotNet/MethodDef.cs
+++ b/src/DotNet/MethodDef.cs
@@ -853,6 +853,14 @@ public bool IsAggressiveOptimization {
 		public bool HasSecurityMitigations {
 			get => ((MethodImplAttributes)implAttributes & MethodImplAttributes.SecurityMitigations) != 0;
 			set => ModifyImplAttributes(value, MethodImplAttributes.SecurityMitigations);
+		}
+
+		/// <summary>
+		/// Gets/sets the <see cref="MethodImplAttributes.Async"/> bit
+		/// </summary>
+		public bool IsAsync {
+			get => ((MethodImplAttributes)implAttributes & MethodImplAttributes.Async) != 0;
+			set => ModifyImplAttributes(value, MethodImplAttributes.Async);
 		}
 
 		/// <summary>
diff --git a/src/DotNet/MethodImplAttributes.cs b/src/DotNet/MethodImplAttributes.cs
index b1d3b3a4..eaedf3cc 100644
--- a/src/DotNet/MethodImplAttributes.cs
+++ b/src/DotNet/MethodImplAttributes.cs
@@ -46,5 +46,7 @@ public enum MethodImplAttributes : ushort {
 		AggressiveOptimization	= 0x0200,
 		/// <summary>The JIT compiler should look for security mitigation attributes, such as the user-defined System.Runtime.CompilerServices.SecurityMitigationsAttribute. If found, the JIT compiler applies any related security mitigations. Available starting with .NET Framework 4.8.</summary>
 		SecurityMitigations		= 0x0400,
+		/// <summary>Method requires async state machine rewrite. Available starting with .NET 11.0.</summary>
+		Async					= 0x2000,
 	}
 }