diff --git a/Library/.rubocop.yml b/Library/.rubocop.yml
index ffb472cd3e..4e029176cf 100644
--- a/Library/.rubocop.yml
+++ b/Library/.rubocop.yml
@@ -183,7 +183,6 @@ Naming/MethodName:
     - '\A(fetch_)?HEAD\?\Z'
 
 # allow those that are standard
-# TODO: try to remove some of these
 Naming/MethodParameterName:
   inherit_mode:
     merge:
@@ -194,7 +193,6 @@ Naming/MethodParameterName:
       "b",
       "c1",
       "c2",
-      "d",
       "e",
       "f",
       "ff",
diff --git a/Library/Homebrew/cleaner.rb b/Library/Homebrew/cleaner.rb
index 32954f6b0c..ca0787cfab 100644
--- a/Library/Homebrew/cleaner.rb
+++ b/Library/Homebrew/cleaner.rb
@@ -117,8 +117,8 @@ class Cleaner
   #
   # lib may have a large directory tree (see Erlang for instance), and
   # clean_dir applies cleaning rules to the entire tree
-  def clean_dir(d)
-    d.find do |path|
+  def clean_dir(directory)
+    directory.find do |path|
       path.extend(ObserverPathnameExtension)
 
       Find.prune if @f.skip_clean? path
diff --git a/Library/Homebrew/cmd/deps.rb b/Library/Homebrew/cmd/deps.rb
index f04add7c65..d381f546be 100644
--- a/Library/Homebrew/cmd/deps.rb
+++ b/Library/Homebrew/cmd/deps.rb
@@ -196,17 +196,17 @@ module Homebrew
     str
   end
 
-  def self.deps_for_dependent(d, args:, recursive: false)
+  def self.deps_for_dependent(dependency, args:, recursive: false)
     includes, ignores = args_includes_ignores(args)
 
-    deps = d.runtime_dependencies if @use_runtime_dependencies
+    deps = dependency.runtime_dependencies if @use_runtime_dependencies
 
     if recursive
-      deps ||= recursive_includes(Dependency, d, includes, ignores)
-      reqs   = recursive_includes(Requirement, d, includes, ignores)
+      deps ||= recursive_includes(Dependency, dependency, includes, ignores)
+      reqs   = recursive_includes(Requirement, dependency, includes, ignores)
     else
-      deps ||= reject_ignores(d.deps, ignores, includes)
-      reqs   = reject_ignores(d.requirements, ignores, includes)
+      deps ||= reject_ignores(dependency.deps, ignores, includes)
+      reqs   = reject_ignores(dependency.requirements, ignores, includes)
     end
 
     deps + reqs.to_a