diff -up man-pages-3.24/man5/filesystems.5.pom man-pages-3.24/man5/filesystems.5
--- man-pages-3.24/man5/filesystems.5.pom	2010-02-26 05:46:53.000000000 +0100
+++ man-pages-3.24/man5/filesystems.5	2010-06-24 14:12:54.000000000 +0200
@@ -77,6 +77,11 @@ is a journaling version of the ext2 file
 It is easy to
 switch back and forth between ext2 and ext3.
 .TP
+.B ext4
+is the next generation of the ext filesystem series.  In addition to
+journaling, ext4 supports larger files and filesystems than ext3, and provides
+other modern features such as preallocation and an extent-based allocator.
+.TP
 .B Reiserfs
 is a journaling file system, designed by Hans Reiser,
 that was integrated into Linux in kernel 2.4.1.