README.adoc in pragmater-12.1.2 vs README.adoc in pragmater-12.2.0

@@ -33,10 +33,19 @@
 
 . https://www.ruby-lang.org[Ruby]
 
 == Setup
 
-To install, run:
+To install _with_ security, run:
+
+[source,bash]
+----
+# 💡 Skip this line if you already have the public certificate installed.
+gem cert --add <(curl --compressed --location https://alchemists.io/gems.pem)
+gem install pragmater --trust-policy HighSecurity
+----
+
+To install _without_ security, run:
 
 [source,bash]
 ----
 gem install pragmater
 ----