INSTALL in og-0.19.0 vs INSTALL in og-0.20.0

@@ -43,9 +43,13 @@
 	$ ruby install.rb
 
 This installation script also installs some vendor libraries
 that you possibly have allready installed. Use with caution.
 
+You also have to manualy install the following libraries:
+
+* Facets
+* RedCloth
 
 = Manual installation.
 
 Uncompress your distribution (Unix example):