This is with EnvInject plugin 1.72, Jenkins 1.488.

In a job configuration, "Build Environment" --> "Inject environment variables to the build process", the help text for "Properties File Path" says "the process is executed before a SCM checkout".

However, when I run it, it's quite clear that this is processed AFTER the SCM checkout - which is good, since it means I can have my properties file under source control.

The console shows this:

[EnvInject] - Executing scripts and injecting environment variables after the SCM step.
[EnvInject] - Injecting as environment variables the properties file path 'builder/hudson/env-vars-GDA-master-set1.properties'

The help text needs changing so that it describes what actually happens.

The same wrong help text appears when you have a "Build Step" of "Inject environment variables".