diff --git a/lib/tasks/optimize.js b/lib/tasks/optimize.js
index 77e5e23..912468a 100644
--- a/lib/tasks/optimize.js
+++ b/lib/tasks/optimize.js
@@ -57,20 +57,21 @@ Optimize = (function() {
   Optimize.prototype._executeOptimize = function(runConfig, callback) {
     var err,
       _this = this;
-    logger.info("Beginning r.js optimization to result in [[ " + runConfig.out + " ]]");
+    if (runConfig.out) {
+      logger.info("Beginning r.js optimization to result in [[ " + runConfig.out + " ]]");
+    } else {
+      logger.info("Beginning r.js optimization");
+    }
     this._logRunConfig(runConfig);
     try {
       return requirejs.optimize(runConfig, function(buildResponse) {
-        var i, reportLine, reportLines, _i, _len;
-        reportLines = buildResponse.split("\n");
-        for (i = _i = 0, _len = reportLines.length; _i < _len; i = ++_i) {
-          reportLine = reportLines[i];
-          if (reportLine.indexOf('---') === 0) {
-            runConfig.filesUsed = reportLines.splice(i + 1, reportLines.length - (i + 2));
-            break;
-          }
+        if (runConfig.out) {
+          _this._reportSingleFileOutput(runConfig, buildResponse);
+        } else if (runConfig.dir) {
+          _this._reportMultiFileOutput(runConfig);
+        } else {
+          logger.debug("Unexpected exit, not .out, not .dir.");
         }
-        logger.success("The compiled file [[ " + runConfig.out + " ]] is ready for use.", true);
         return callback();
       });
     } catch (_error) {
@@ -80,6 +81,44 @@ Optimize = (function() {
     }
   };
 
+  Optimize.prototype._reportSingleFileOutput = function(runConfig, buildResponse) {
+    var builtFile, i, reportLine, reportLines, _i, _len;
+    reportLines = buildResponse.split("\n");
+    builtFile = void 0;
+    for (i = _i = 0, _len = reportLines.length; _i < _len; i = ++_i) {
+      reportLine = reportLines[i];
+      if (reportLine.indexOf('---') === 0) {
+        runConfig.filesUsed = reportLines.splice(i + 1, reportLines.length - (i + 2)).filter(function(used) {
+          return used !== builtFile;
+        });
+        break;
+      } else {
+        builtFile = reportLine;
+      }
+    }
+    return logger.success("The compiled file [[ " + builtFile + " ]] is ready for use.", true);
+  };
+
+  Optimize.prototype._reportMultiFileOutput = function(runConfig) {
+    var buildResponse, buildTxtPath, f, filesBuiltReportLines, filesUsed, _i, _len;
+    buildTxtPath = path.join(runConfig.dir, "build.txt");
+    if (fs.existsSync(buildTxtPath)) {
+      buildResponse = fs.readFileSync(buildTxtPath, "ascii");
+      filesBuiltReportLines = buildResponse.split('\n\n');
+      filesUsed = [];
+      for (_i = 0, _len = filesBuiltReportLines.length; _i < _len; _i++) {
+        f = filesBuiltReportLines[_i];
+        this._reportSingleFileOutput(runConfig, f);
+        filesUsed = filesUsed.concat(runConfig.filesUsed);
+      }
+      return runConfig.filesUsed = filesUsed.map(function(f) {
+        return path.join(runConfig.dir, f);
+      });
+    } else {
+      return logger.info("Cannot locate build.txt for post r.js run cleanup purposes.");
+    }
+  };
+
   return Optimize;
 
 })();
diff --git a/src/tasks/optimize.coffee b/src/tasks/optimize.coffee
index 0c9947c..3dedc3e 100644
--- a/src/tasks/optimize.coffee
+++ b/src/tasks/optimize.coffee
@@ -37,22 +37,50 @@ class Optimize
       cache = null
 
   _executeOptimize: (runConfig, callback) =>
-    logger.info "Beginning r.js optimization to result in [[ #{runConfig.out} ]]"
+    if runConfig.out
+      logger.info "Beginning r.js optimization to result in [[ #{runConfig.out} ]]"
+    else
+      logger.info "Beginning r.js optimization"
 
     @_logRunConfig runConfig
 
     try
       requirejs.optimize runConfig, (buildResponse) =>
-        reportLines = buildResponse.split("\n")
-        for reportLine, i in reportLines
-          if reportLine.indexOf('---') is 0
-            runConfig.filesUsed = reportLines.splice(i + 1, reportLines.length - (i + 2))
-            break
-
-        logger.success "The compiled file [[ #{runConfig.out} ]] is ready for use.", true
+        if runConfig.out
+          @_reportSingleFileOutput runConfig, buildResponse
+        else if runConfig.dir
+          @_reportMultiFileOutput runConfig
+        else
+          logger.debug "Unexpected exit, not .out, not .dir."
         callback()
     catch err
       logger.error "Error occured inside r.js optimizer, error is as follows... #{err}"
       callback()
 
+  _reportSingleFileOutput: (runConfig, buildResponse)->
+    reportLines = buildResponse.split("\n")
+    builtFile = undefined
+    for reportLine, i in reportLines
+      if reportLine.indexOf('---') is 0
+        runConfig.filesUsed = reportLines.splice(i + 1, reportLines.length - (i + 2)).filter (used) ->
+          used isnt builtFile
+        break
+      else
+        builtFile = reportLine
+
+    logger.success "The compiled file [[ #{builtFile} ]] is ready for use.", true
+
+  _reportMultiFileOutput: (runConfig) ->
+    buildTxtPath = path.join runConfig.dir, "build.txt"
+    if fs.existsSync buildTxtPath
+      buildResponse = fs.readFileSync buildTxtPath, "ascii"
+      filesBuiltReportLines = buildResponse.split('\n\n')
+      filesUsed = []
+      for f in filesBuiltReportLines
+        @_reportSingleFileOutput runConfig, f
+        filesUsed = filesUsed.concat runConfig.filesUsed
+      runConfig.filesUsed = filesUsed.map (f) -> path.join runConfig.dir, f
+    else
+      logger.info "Cannot locate build.txt for post r.js run cleanup purposes."
+
 exports.execute = new Optimize().execute
\ No newline at end of file