Update README.md (#74)

Author: keyur32

README.md

@@ -4,6 +4,14 @@ Custom functions enable you to add new functions to Excel by defining those func
 
 This repository contains the source code used by the [Yo Office generator](https://github.com/OfficeDev/generator-office) when you create a new custom functions project. You can also use this repository as a sample to base your own custom functions project from if you choose not to use the generator. For more detailed information about custom functions in Excel, see the [Custom functions overview](https://docs.microsoft.com/office/dev/add-ins/excel/custom-functions-overview) article in the Office Add-ins documentation or see the [additional resources](#additional-resources) section of this repository.
 
+## Known Issues and Workarounds
+In the 32 bit version of the Office 365 *December* Insiders Version 1901 (Build 11128.20000),  Custom Functions may not work properly (i.e. get stuck at "#GETTING_DATA"). 
+To workaround this bug, please:
+1. Download the file: https://github.com/OfficeDev/Excel-Custom-Functions/blob/december-insiders-workaround/excel-udf-host.win32.bundle
+2. Copy it your "C:\Program Files (x86)\Microsoft Office\root\Office16" folder.
+
+This does not affect Excel Online, and will be resolved in the January Insiders build update.
+
 ## Questions and comments
 
 We'd love to get your feedback about this sample. You can send your feedback to us in the *Issues* section of this repository.
@@ -21,4 +29,4 @@ Questions about Microsoft Office 365 development in general should be posted to
 This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information, see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [[email protected]](mailto:[email protected]) with any additional questions or comments.
 
 ## Copyright
-Copyright (c) 2017 Microsoft Corporation. All rights reserved.
+Copyright (c) 2017 Microsoft Corporation. All rights reserved.