diff --git a/HISTORY.txt b/HISTORY.txt
index 8294ee2..bf568cd 100644
--- a/HISTORY.txt
+++ b/HISTORY.txt
@@ -1,5 +1,12 @@
 Minify Release History
 
+Version 2.1.1
+    * Bug fix release
+    * Detection and workarounds for zlib.output_compression and non-PHP encoding modules
+    * Zlib not required (mod_rewrite, et.al., can still be used for encoding)
+    * HTML : More IE conditional comments preserved
+    * Minify_groupUri() utility fixed
+
 Version 2.1.0
     * "min" default application for quick deployment
     * Minify URI Builder app & bookmarklet for quickly creating minify URIs
diff --git a/UPGRADING.txt b/UPGRADING.txt
new file mode 100644
index 0000000..ffe79a3
--- /dev/null
+++ b/UPGRADING.txt
@@ -0,0 +1,16 @@
+Minify Upgrade Guide
+
+= From 2.1.0 to 2.1.1 =
+
+1. Add the following 2 lines to the end of your existing /min/config.php file:
+    
+    // try to disable output_compression (may not have an effect)
+    ini_set('zlib.output_compression', '0');
+
+2. Overwrite all files EXCEPT the following three with those in the 2.1.1 release:
+
+    /min/config.php        <-- do NOT overwrite!
+    /min/groupsConfig.php  <-- do NOT overwrite!
+    /min/.htaccess         <-- do NOT overwrite!
+    
+3. (optional) Delete all the Minify files from your cache directory ($min_cachePath).