diff --git a/lib/pry/config/behavior.rb b/lib/pry/config/behavior.rb
index 29eea187..d72d7afa 100644
--- a/lib/pry/config/behavior.rb
+++ b/lib/pry/config/behavior.rb
@@ -91,6 +91,10 @@ module Pry::Config::Behavior
   end
   alias_method :eql?, :==
 
+  def keys
+    @writes.keys
+  end
+
   def to_hash
     @writes.dup
   end
diff --git a/spec/config_spec.rb b/spec/config_spec.rb
index bfbaaa89..aa38a1bc 100644
--- a/spec/config_spec.rb
+++ b/spec/config_spec.rb
@@ -51,6 +51,14 @@ describe Pry::Config do
   end
 
 
+  describe "#keys" do
+    it "returns an array of local keys" do
+      root = Pry::Config.from_hash({zoo: "boo"}, nil)
+      local = Pry::Config.from_hash({foo: "bar"}, root)
+      local.keys.should == ["foo"]
+    end
+  end
+
   describe "#==" do
     it "compares equality through the underlying lookup table" do
       local1 = Pry::Config.new(nil)