diff --git a/Library/Homebrew/os/mac/mach.rb b/Library/Homebrew/os/mac/mach.rb
index 93cab7de4f..aef8164268 100644
--- a/Library/Homebrew/os/mac/mach.rb
+++ b/Library/Homebrew/os/mac/mach.rb
@@ -3,19 +3,21 @@
 require "macho"
 require "os/mac/architecture_list"
 
+# {Pathname} extension for dealing with Mach-O files.
+#
+# @api private
 module MachOShim
   extend Forwardable
 
   delegate [:dylib_id, :rpaths, :delete_rpath] => :macho
 
-  # @private
   def macho
     @macho ||= begin
       MachO.open(to_s)
     end
   end
+  private :macho
 
-  # @private
   def mach_data
     @mach_data ||= begin
       machos = []
@@ -55,6 +57,7 @@ module MachOShim
       []
     end
   end
+  private :mach_data
 
   def dynamically_linked_libraries(except: :none)
     lcs = macho.dylib_load_commands.reject { |lc| lc.type == except }
@@ -94,19 +97,16 @@ module MachOShim
     arch == :ppc64
   end
 
-  # @private
   def dylib?
     mach_data.any? { |m| m.fetch(:type) == :dylib }
   end
 
-  # @private
   def mach_o_executable?
     mach_data.any? { |m| m.fetch(:type) == :executable }
   end
 
   alias binary_executable? mach_o_executable?
 
-  # @private
   def mach_o_bundle?
     mach_data.any? { |m| m.fetch(:type) == :bundle }
   end