diff --git a/Library/Homebrew/test/utils/analytics_spec.rb b/Library/Homebrew/test/utils/analytics_spec.rb
index 431d8a2448..de1e8c5d25 100644
--- a/Library/Homebrew/test/utils/analytics_spec.rb
+++ b/Library/Homebrew/test/utils/analytics_spec.rb
@@ -11,10 +11,30 @@ describe Utils::Analytics do
         described_class.clear_os_arch_prefix_ci
       end
 
-      it "returns OS_VERSION and prefix when HOMEBREW_PREFIX is a custom prefix" do
+      let(:ci) { ", CI" if ENV["CI"] }
+
+      it "returns OS_VERSION and prefix when HOMEBREW_PREFIX is a custom prefix on intel" do
         allow(Hardware::CPU).to receive(:type).and_return(:intel)
+        allow(Hardware::CPU).to receive(:in_rosetta2?).and_return(false)
         allow(Homebrew).to receive(:default_prefix?).and_return(false)
-        expect(described_class.os_arch_prefix_ci).to include("#{OS_VERSION}, #{described_class.custom_prefix_label}")
+        expected = "#{OS_VERSION}, #{described_class.custom_prefix_label}#{ci}"
+        expect(described_class.os_arch_prefix_ci).to eq expected
+      end
+
+      it "returns OS_VERSION, ARM and prefix when HOMEBREW_PREFIX is a custom prefix on arm" do
+        allow(Hardware::CPU).to receive(:type).and_return(:arm)
+        allow(Hardware::CPU).to receive(:in_rosetta2?).and_return(false)
+        allow(Homebrew).to receive(:default_prefix?).and_return(false)
+        expected = "#{OS_VERSION}, ARM, #{described_class.custom_prefix_label}#{ci}"
+        expect(described_class.os_arch_prefix_ci).to eq expected
+      end
+
+      it "returns OS_VERSION, Rosetta and prefix when HOMEBREW_PREFIX is a custom prefix on Rosetta", :needs_macos do
+        allow(Hardware::CPU).to receive(:type).and_return(:intel)
+        allow(Hardware::CPU).to receive(:in_rosetta2?).and_return(true)
+        allow(Homebrew).to receive(:default_prefix?).and_return(false)
+        expected = "#{OS_VERSION}, Rosetta, #{described_class.custom_prefix_label}#{ci}"
+        expect(described_class.os_arch_prefix_ci).to eq expected
       end
 
       it "does not include prefix when HOMEBREW_PREFIX is the default prefix" do
diff --git a/manpages/brew.1 b/manpages/brew.1
index 3d675fde6c..0d56af5014 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -1,7 +1,7 @@
 .\" generated with Ronn/v0.7.3
 .\" http://github.com/rtomayko/ronn/tree/0.7.3
 .
-.TH "BREW" "1" "November 2021" "Homebrew" "brew"
+.TH "BREW" "1" "December 2021" "Homebrew" "brew"
 .
 .SH "NAME"
 \fBbrew\fR \- The Missing Package Manager for macOS (or Linux)