diff --git a/README.md b/README.md
index cc6cd1c..558e887 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,10 @@
 ### First, log off every account that logs on to Microsoft Word.
 ### Second, download this and install it. You won't get any new apps but after running it will clear your Office license. [License Removal Tool](https://go.microsoft.com/fwlink/?linkid=849815)
 ### Last, download this and install it.  You won't get new apps but this will activate your Office. [Serializer](https://raw.githubusercontent.com/litszwaiboris/MSOffice4Mac/master/Microsoft_Office_LTSC_2021_VL_Serializer.pkg)
-### You will get the Office 2021 now.
+### You will get Office 2021 now.
+---
+### If you encounter any problem, just try to reinstall Microsoft Office:
+#### First, Open Finder and go to Applications on the left side, Remove All Microsoft Office Applications.
+#### Next, click the link and install a new copy of Microsoft Office [Office Installer](https://go.microsoft.com/fwlink/?linkid=525133), don't open it after it's installed.
+#### Then, try to repeat those process but this time use the file you've already downloaded.
+#### Hint: License Removal Tool is `Microsoft_Office_License_Removal_2.7.pkg` and Serializer is `Microsoft_Office_LTSC_2021_VL_Serializer.pkg`
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