diff --git a/README.md b/README.md
index 9de7719..7babbdd 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,12 @@ sxml-loader
 
 Scheme XML loader for webpack.
 
+**NOTE**:
+At the moment, the _sxml-loader_ only works with
+[Chicken Scheme](http://call-cc.org/) and its
+[sxml-serializer](http://wiki.call-cc.org/eggref/5/sxml-serializer)
+egg, so you need to install them in order to use the _sxml-loader_.
+
 Usage
 -----
 **SXML**: