diff --git a/README b/README
index f5f02def4..617f713af 100644
--- a/README
+++ b/README
@@ -35,6 +35,14 @@ The following packages are *STRONGLY RECOMMENDED* to be installed:
    pyexiv2          Enables Gramps to manage Exif metadata embedded in your
                     media. Gramps needs version 0.1.3 or greater.
                     Obtain it from: http://tilloy.net/dev/pyexiv2/download.html  
+   PyICU            Improves localised sorting in Gramps. In particular, this
+                    applies to sorting in the various views and in the Narrative
+                    Web output. It is particularly helpful for non-Latin
+                    characters, for non-English locales and on MS Windows and
+                    Mac OS X platforms. If it is not available, sorting is done
+                    through built-in libraries. PyICU is fairly widely available
+                    through the package managers of distributions. The home page
+                    is http://pyicu.osafoundation.org/
 
 The following packages are optional
    gtkspell         Enable spell checking in the notes. Gtkspell depends on