diff --git a/lib/faraday/adapter.rb b/lib/faraday/adapter.rb
index c16227512..6ece3e357 100644
--- a/lib/faraday/adapter.rb
+++ b/lib/faraday/adapter.rb
@@ -60,6 +60,10 @@ def connection(env)
       yield conn
     end
 
+    # Close any persistent connections. The adapter should still be usable after calling close.
+    def close
+    end
+
     def call(env)
       env.clear_body if env.needs_body?
       env.response = Response.new