diff --git a/misc/lib/README b/misc/lib/README
index 35b1f9adc..05dbcd304 100644
--- a/misc/lib/README
+++ b/misc/lib/README
@@ -1 +1,4 @@
-This directory is for libraries that are needed by plugins, filters or styles.
+This directory is for libraries:
+
+* for compatibility with ruby 1.8 and 1.9.
+* for patching about charctor encoding.