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-rwxr-xr-xtool/extlibs.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/tool/extlibs.rb b/tool/extlibs.rb
index 710d8433b5..ee4fd72a16 100755
--- a/tool/extlibs.rb
+++ b/tool/extlibs.rb
@@ -1,4 +1,8 @@
#!/usr/bin/ruby
+
+# Used to download, extract and patch extension libraries (extlibs)
+# for Ruby. See common.mk for Ruby's usage.
+
require 'fileutils'
require 'digest'
require_relative 'downloader'