diff --git a/src/Microsoft.OpenApi.CSharpAnnotations.DocumentGeneration/Extensions/TypeExtensions.cs b/src/Microsoft.OpenApi.CSharpAnnotations.DocumentGeneration/Extensions/TypeExtensions.cs
index 42173e0..3141143 100644
--- a/src/Microsoft.OpenApi.CSharpAnnotations.DocumentGeneration/Extensions/TypeExtensions.cs
+++ b/src/Microsoft.OpenApi.CSharpAnnotations.DocumentGeneration/Extensions/TypeExtensions.cs
@@ -31,6 +31,7 @@ public static class TypeExtensions
                 [typeof(decimal)] = () => new OpenApiSchema {Type = "number", Format = "double"},
                 [typeof(DateTime)] = () => new OpenApiSchema {Type = "string", Format = "date-time"},
                 [typeof(DateTimeOffset)] = () => new OpenApiSchema {Type = "string", Format = "date-time"},
+                [typeof(TimeSpan)] = () => new OpenApiSchema {Type = "string"},
                 [typeof(Guid)] = () => new OpenApiSchema {Type = "string", Format = "uuid"},
                 [typeof(char)] = () => new OpenApiSchema {Type = "string"},
 
@@ -45,6 +46,7 @@ public static class TypeExtensions
                 [typeof(double?)] = () => new OpenApiSchema {Type = "number", Format = "double", Nullable = true},
                 [typeof(decimal?)] = () => new OpenApiSchema {Type = "number", Format = "double", Nullable = true},
                 [typeof(DateTime?)] = () => new OpenApiSchema {Type = "string", Format = "date-time", Nullable = true},
+                [typeof(TimeSpan?)] = () => new OpenApiSchema {Type = "string", Nullable = true},
                 [typeof(DateTimeOffset?)] = () =>
                     new OpenApiSchema {Type = "string", Format = "date-time", Nullable = true},
                 [typeof(Guid?)] = () => new OpenApiSchema {Type = "string", Format = "uuid", Nullable = true},