update actions summary

README.md

@@ -1,7 +1,11 @@
 
 # Trufflehog Actions Scan :pig_nose::key:
 
-Scan repository for secrets with basic [trufflehog](https://github.com/dxa4481/truffleHog) defaults in place for easy setup.
+Scan recent commits in repository for secrets with basic [trufflehog](https://github.com/dxa4481/truffleHog) defaults in place for easy setup.
+
+This action is intended as a Continuous Integration secret scan in an already "clean" repository. The default commit scan depth is the last 50 commits and can be adjusted using Custom Arguments (see below).
+
+It is recommended to run a basic trufflehog scan on your entire repository prior to relying on this CI solution (Note: this can be done manually from the command line or by using this action with custom options `"--regex --entropy=False"`).
 
 ## Usage