diff --git a/lib/Minify/Lines.php b/lib/Minify/Lines.php
new file mode 100644
index 0000000..c9cf8fe
--- /dev/null
+++ b/lib/Minify/Lines.php
@@ -0,0 +1,95 @@
+<?php
+/**
+ * Class Minify_Lines  
+ * @package Minify
+ */
+
+/**
+ * Add line numbers in C-style comments for easier debugging of combined content
+ *
+ * @package Minify
+ * @author Stephen Clay <steve@mrclay.org>
+ */
+class Minify_Lines {
+
+    /**
+     * Add line numbers in C-style comments
+     * 
+     * @param string $content
+     * 
+     * @param array $options available options:
+     * 
+     * 'id': (optional) short string to identify file. E.g. "jqp" for plugins.jquery.js
+     * 
+     * @return string 
+     */
+    public static function minify($content, $options = array()) 
+    {
+        $id = (isset($options['id']) && $options['id'])
+            ? $options['id']
+            : '';
+        if (! $eol = self::_getEol($content)) {
+            return $content;
+        }
+        $lines = explode($eol, $content);
+        $numLines = count($lines);
+        // determine left padding
+        $padTo = max(strlen($numLines), strlen($id));
+        $inComment = false;
+        for ($i = 0; $i < $numLines; ++$i) {
+            $n = $i + 1;
+            $line = $lines[$i];
+            $note = (('' !== $id) && (1 == $n % 30))
+                ? $id
+                : $n;
+            $lines[$i] = self::_addNote($line, $note, $inComment, $padTo);
+            $inComment = self::_eolInComment($line, $inComment);
+        }
+        return implode($eol, $lines) . $eol;
+    }
+    
+    /**
+     * Determine EOL character sequence
+     *
+     * @param string $str file content
+     * 
+     * @return string EOL char(s) or '' if no EOL could be found
+     */
+    private static function _getEol($str)
+    {
+        $r = strpos($str, "\r");
+        $n = strpos($str, "\n");
+        if (false === $r && false === $n) {
+            return '';
+        }
+        return ($r !== false)
+            ? ($n == ($r + 1) 
+                ? "\r\n"
+                : "\r")
+            : "\n";
+    }
+    
+    private static function _eolInComment($line, $inComment)
+    {
+        while (strlen($line)) {
+            $search = $inComment
+                ? '*/'
+                : '/*';
+            $pos = strpos($line, $search);
+            if (false === $pos) {
+                return $inComment;
+            } else {
+                $inComment = ! $inComment;
+                $line = substr($line, $pos + 2);
+            }
+        }
+        return $inComment;
+    }
+    
+    private static function _addNote($line, $note, $inComment, $padTo)
+    {
+        return $inComment
+            ? '/* ' . str_pad($note, $padTo, ' ', STR_PAD_RIGHT) . ' *  ' . $line
+            : '/* ' . str_pad($note, $padTo, ' ', STR_PAD_RIGHT) . ' */ ' . $line;
+    }
+}