diff --git a/Library/Homebrew/cmd/fetch.rb b/Library/Homebrew/cmd/fetch.rb
index 080aa17678..af75f9995e 100644
--- a/Library/Homebrew/cmd/fetch.rb
+++ b/Library/Homebrew/cmd/fetch.rb
@@ -20,9 +20,9 @@ module Homebrew
         Download a bottle (if available) or source packages for <formula>e
         and binaries for <cask>s. For files, also print SHA-256 checksums.
       EOS
-      # This is needed for testing cask downloads on CI.
+      # This is needed for downloading ARM casks in CI.
       flag "--arch=",
-           description: "Download for the given arch.",
+           description: "Download for the given CPU architecture.",
            hidden:      true
       flag "--bottle-tag=",
            description: "Download a bottle for given tag."
diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 3003a9e9bf..96fdb7aea1 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -31,6 +31,10 @@ module Homebrew
         locally available formulae and casks and skip style checks. Will exit with a
         non-zero status if any errors are found.
       EOS
+      # This is needed for auditing ARM casks in CI.
+      flag "--arch=",
+           description: "Audit the given CPU architecture.",
+           hidden:      true
       switch "--strict",
              description: "Run additional, stricter style checks."
       switch "--git",
@@ -104,6 +108,10 @@ module Homebrew
   def self.audit
     args = audit_args.parse
 
+    if (arch = args.arch)
+      SimulateSystem.arch = arch.to_sym
+    end
+
     Homebrew.auditing = true
     inject_dump_stats!(FormulaAuditor, /^audit_/) if args.audit_debug?