diff --git a/Library/Homebrew/cmd/--cache.rb b/Library/Homebrew/cmd/--cache.rb
index d21f3bd8cd..4a9d93889e 100644
--- a/Library/Homebrew/cmd/--cache.rb
+++ b/Library/Homebrew/cmd/--cache.rb
@@ -35,6 +35,7 @@ module Homebrew
     end
   end
 
+  sig { void }
   def __cache
     args = __cache_args.parse
 
@@ -60,6 +61,7 @@ module Homebrew
     end
   end
 
+  sig { params(formula: Formula, args: CLI::Args).void }
   def print_formula_cache(formula, args:)
     if fetch_bottle?(formula, args: args)
       puts formula.bottle.cached_download
@@ -68,6 +70,7 @@ module Homebrew
     end
   end
 
+  sig { params(cask: Cask::Cask).void }
   def print_cask_cache(cask)
     puts Cask::Download.new(cask).downloader.cached_location
   end