diff --git a/man/man1/du.1 b/man/man1/du.1
index 850464143..217d4a6d7 100644
--- a/man/man1/du.1
+++ b/man/man1/du.1
@@ -26,7 +26,8 @@ du \- print disk usage
 .SH DESCRIPTION
 .PP
 \fIDu\fR examines one or more directories and prints the amount of space 
-occupied by the files in those directories and their subdirectories.
+occupied by the files in those directories and their subdirectories in
+kilobytes.
 .SH BUGS
 \fIDu\fR calculates disk usage based on file size. It could be there
 are holes in the file, not occupying any actual disk blocks, causing