diff --git a/Library/Homebrew/github_packages.rb b/Library/Homebrew/github_packages.rb
index dd0eefed30..f59220ea7b 100644
--- a/Library/Homebrew/github_packages.rb
+++ b/Library/Homebrew/github_packages.rb
@@ -356,11 +356,14 @@ class GitHubPackages
 
       documentation = "https://formulae.brew.sh/formula/#{formula_name}" if formula_core_tap
 
+      local_file_size = File.size(local_file)
+
       descriptor_annotations_hash = {
         "org.opencontainers.image.ref.name" => tag,
         "sh.brew.bottle.cpu.variant"        => cpu_variant,
         "sh.brew.bottle.digest"             => tar_gz_sha256,
         "sh.brew.bottle.glibc.version"      => glibc_version,
+        "sh.brew.bottle.size"               => local_file_size,
         "sh.brew.tab"                       => tab.to_json,
       }.reject { |_, v| v.blank? }