diff --git a/README.markdown b/README.markdown
index 791839b..4294433 100644
--- a/README.markdown
+++ b/README.markdown
@@ -55,6 +55,7 @@ Options are as follows:
         --global-export[=GLOBAL_VAR] If GLOBAL_VAR is specified and only one module is being processed, exports it to the GLOBAL_VAR global variable.
                                      If GLOBAL_VAR is specified and multiple modules are being processed, exports each one of them as a property of GLOBAL_VAR.
                                      If GLOBAL_VAR isn't specified, exports the module to global variables corresponding to their identifier.
+        --main-module=MAIN_MODULE    Set the identifier of the main module (available through `require.main`).
         --sync                       Load all dependencies synchronously.
         --dependency-graph[=OUTPUT]  Create a dependency graph of the module.
     -h, --help                       Show this message.
diff --git a/bin/modulrize b/bin/modulrize
index 50716ba..1f29ee5 100755
--- a/bin/modulrize
+++ b/bin/modulrize
@@ -35,6 +35,10 @@ opts = OptionParser.new do |opts|
     options[:global] = global || true
   end
   
+  opts.on('--main-module=MAIN_MODULE', 'Set the identifier of the main module (available through `require.main`).') do |main_module|
+    options[:main_module] = main_module
+  end
+  
   opts.on('--sync', 'Load all dependencies synchronously.') do |global|
     options[:sync] = true
   end
diff --git a/lib/modulr/collector.rb b/lib/modulr/collector.rb
index d041fb6..c1a5788 100644
--- a/lib/modulr/collector.rb
+++ b/lib/modulr/collector.rb
@@ -15,6 +15,7 @@ def to_js(buffer = '')
       buffer << "\n(function() {"
       buffer << lib
       buffer << transport
+      reorder_top_level_modules
       buffer << requires
       buffer << "})();\n"
     end
@@ -37,6 +38,24 @@ def reset
         top_level_modules.clear
       end
       
+      def main_module?
+        !!main_module
+      end
+
+      def main_module
+        if mm_id = @options[:main_module]
+          @top_level_modules.find { |m| m.id == mm_id }
+        end
+      end
+
+      def reorder_top_level_modules
+        if mm = main_module
+          index = top_level_modules.index(mm)
+          top_level_modules[index] = top_level_modules[0]
+          top_level_modules[0] = mm
+        end
+      end
+      
       def module_from_path(path)
         identifier = File.basename(path, '.js')
         root = @root || File.dirname(path)
diff --git a/lib/modulr/sync_collector.rb b/lib/modulr/sync_collector.rb
index 9abbfac..f751be6 100644
--- a/lib/modulr/sync_collector.rb
+++ b/lib/modulr/sync_collector.rb
@@ -8,7 +8,7 @@ def add_module_from_path(path)
     private
       def lib
         output = File.read(PATH_TO_MODULR_SYNC_JS)
-        if top_level_modules.size > 1
+        if top_level_modules.size > 1 && !main_module?
           output << "\nvar module = {};\n"
           output << "\nrequire.main = module;\n"
         end
@@ -18,6 +18,5 @@ def lib
       def requires
         top_level_modules.map { |m| "\n  require('#{m.id}');" }.join
       end
-
   end
 end
\ No newline at end of file