diff --git a/Formula/msg-cli.rb b/Formula/msg-cli.rb
index 58607ab..7601a78 100644
--- a/Formula/msg-cli.rb
+++ b/Formula/msg-cli.rb
@@ -53,6 +53,15 @@ class MsgCli < Formula
     system "guild", "compile", "-o", "#{prefix}/lib/guile/3.0/site-ccache/msg/machine.go", "#{prefix}/share/guile/site/3.0/msg/machine.scm"
   end
 
+   def caveats
+    <<~EOS
+      Add the following to your .bashrc or equivalent:
+        export GUILE_LOAD_PATH="#{HOMEBREW_PREFIX}/share/guile/site/3.0"
+        export GUILE_LOAD_COMPILED_PATH="#{HOMEBREW_PREFIX}/lib/guile/3.0/site-ccache"
+        export GUILE_SYSTEM_EXTENSIONS_PATH="#{HOMEBREW_PREFIX}/lib/guile/3.0/extensions"
+    EOS
+  end
+
   test do
     # `test do` will create, run in and delete a temporary directory.
     #