Added documentation to target net5 for now

Author: jbearfoot

README.md

@@ -9,11 +9,16 @@ These extensions expand the upgrade-assistant tools's functionality to make Opti
 Install the latest vesion of the upgrade-assistant `dotnet tool install -g upgrade-assistant` or upgrade `dotnet tool update -g upgrade-assistant`
 
 
-Grab the latest release from [here](https://github.com/episerver/upgrade-assistant-extensions/releases) and unzip the file to a location of your computer (ex C:\temp\epi.source.updater).  Technically you should be able to point the zip file instead of extracting but there seems to be a bug in upgrade-assisant at the moment for that.
+Grab the latest release from [here](https://github.com/episerver/upgrade-assistant-extensions/releases) and unzip the file to a location of your computer (ex C:\temp\epi.source.updater).  Technically you should be able to point the zip file instead of extracting but there seems to be a bug in upgrade-assistant at the moment for that.
 
 ## Using the extension
+Some of the source code upgrade code analyzers requires that packages referenced are available in selected target framework. So for now when CMS targets net5.0 the recommendation is to target net5.0 when converting as well (target framework can be set to net6.0 after conversion is completed). To achieve this first set environment variable like:
+```
+set DefaultTargetFrameworks__LTS=net5.0
+```
+then run upgrade-assistant with flag *--target-tfm-support LTS*, like:
 
 ```
-upgrade-assistant upgrade {projectName}.csproj --extension "{extensionPath}" --ignore-unsupported-features
+upgrade-assistant upgrade {projectName}.csproj --extension "{extensionPath}" --ignore-unsupported-features --target-tfm-support LTS
 ```