diff --git a/README.md b/README.md
index a678de2..28d4a9c 100644
--- a/README.md
+++ b/README.md
@@ -113,7 +113,7 @@ SIGNALS
 
 The pool manager responds to the following signals:
 
-* `HUP`   - reload the config file, reload logfiles, restart all workers.
+* `HUP`   - reset config loader (reload the config file), reload logfiles, restart all workers.
 * `QUIT`  - gracefully shut down workers (via `QUIT`) and shutdown the manager
   after all workers are done.
 * `INT`   - gracefully shut down workers (via `QUIT`) and immediately shutdown manager
@@ -155,6 +155,14 @@ Resque::Pool.config_loader = lambda {|env|
 end
 ```
 
+The configuration loader's `#call` method will be invoked every time a worker
+completes a job. This allows the configuration to constantly change, for example,
+to scale the number of workers up/down based on different conditions.
+If the response is generally static, the loader may want to cache the value it
+returns. It can optionally implement a `#reset!` method, which will be invoked
+when the HUP signal is received, allowing the loader to flush its cache, or
+perform any other re-initialization.
+
 Other Features
 --------------
 
diff --git a/lib/resque/pool.rb b/lib/resque/pool.rb
index 50fcc86..62613b9 100644
--- a/lib/resque/pool.rb
+++ b/lib/resque/pool.rb
@@ -110,6 +110,11 @@ def load_config
       @config = config_loader.call(environment)
     end
 
+    def reset_config
+      config_loader.reset! if config_loader.respond_to?(:reset!)
+      load_config
+    end
+
     def environment
       if defined? RAILS_ENV
         RAILS_ENV
@@ -176,8 +181,8 @@ def handle_sig_queue!
         log "#{signal}: sending to all workers"
         signal_all_workers(signal)
       when :HUP
-        log "HUP: reload config file and reload logfiles"
-        load_config
+        log "HUP: reset configuration and reload logfiles"
+        reset_config
         Logging.reopen_logs!
         log "HUP: gracefully shutdown old children (which have old logfiles open)"
         if term_child
@@ -280,6 +285,7 @@ def join
         break if handle_sig_queue! == :break
         if sig_queue.empty?
           master_sleep
+          load_config
           maintain_worker_count
         end
         procline("managing #{all_pids.inspect}")
diff --git a/lib/resque/pool/file_or_hash_loader.rb b/lib/resque/pool/file_or_hash_loader.rb
index 8a15a95..ab66b2e 100644
--- a/lib/resque/pool/file_or_hash_loader.rb
+++ b/lib/resque/pool/file_or_hash_loader.rb
@@ -11,7 +11,11 @@ def initialize(filename_or_hash=nil)
   end
 
   def call(environment)
-    load_config_from_file(environment)
+    @config ||= load_config_from_file(environment)
+  end
+
+  def reset!
+    @config = nil
   end
 
   private
diff --git a/spec/resque_pool_spec.rb b/spec/resque_pool_spec.rb
index 09233e6..94cce8e 100644
--- a/spec/resque_pool_spec.rb
+++ b/spec/resque_pool_spec.rb
@@ -184,6 +184,8 @@ module Rails; end
 
       File.open(config_file_path, "w"){|f| f.write "changed: 1"}
       subject.config.keys.should == ["orig"]
+      subject.load_config
+      subject.config.keys.should == ["orig"]
     end
 
     it "should reload the changes on HUP signal" do
@@ -191,6 +193,8 @@ module Rails; end
 
       File.open(config_file_path, "w"){|f| f.write "changed: 1"}
       subject.config.keys.should == ["orig"]
+      subject.load_config
+      subject.config.keys.should == ["orig"]
 
       simulate_signal subject, :HUP
 
@@ -212,22 +216,30 @@ module Rails; end
   end
 
   it "should reset the config loader on HUP" do
-    custom_loader = double(call: Hash.new)
+    custom_loader = double(call: Hash.new, reset!: true)
 
     pool = no_spawn(Resque::Pool.new(custom_loader))
     custom_loader.should have_received(:call).once
 
     pool.sig_queue.push :HUP
     pool.handle_sig_queue!
+    custom_loader.should have_received(:reset!)
     custom_loader.should have_received(:call).twice
   end
 
   it "can be a lambda" do
     RAILS_ENV = "fake"
+    count = 1
     pool = no_spawn(Resque::Pool.new(lambda {|env|
-      {env.reverse => 1}
+      {env.reverse => count}
     }))
     pool.config.should == {"ekaf" => 1}
+
+    count = 3
+    pool.sig_queue.push :HUP
+    pool.handle_sig_queue!
+
+    pool.config.should == {"ekaf" => 3}
   end
 end