diff --git a/libjava/ChangeLog b/libjava/ChangeLog
index 15a2c566acb0b1d649a7cd2d1be0699f3fce6b6e..0f924a7f493a626e132e8172371c7a2d444a970c 100644
--- a/libjava/ChangeLog
+++ b/libjava/ChangeLog
@@ -1,3 +1,7 @@
+2001-07-29  Mark Wielaard <mark@klomp.org>
+
+	* HACKING: add description on updating namespace
+
 2001-07-26  Bryce McKinlay  <bryce@waitaki.otago.ac.nz>
 
 	* java/util/Calendar.java (set): Never recompute fields here. They 
diff --git a/libjava/HACKING b/libjava/HACKING
index 651e1a3299399a9c85a7a5606c55d10a473e9755..842617abe755043efca91709ee094b3cfbf13a76 100644
--- a/libjava/HACKING
+++ b/libjava/HACKING
@@ -44,3 +44,20 @@ Install that (dont worry, it should still work for other projects), add your
 files to the Makefile.am, then just type "automake" and it will regenerate the
 Makefile.in. Easy!
 
+Tom Tromey adds:
+If you add a class to java.lang, java.io, or java.util
+(including sub-packages, like java.lang.ref).
+
+* Edit gcj/javaprims.h
+
+* Go to the `namespace java' line, and delete that entire block (the   
+  entire contents of the namespace)
+
+* Then insert the output of `perl ../scripts/classes.pl' into the file
+  at that point.
+
+If you're generating a patch there is a program you can get to do an
+offline `cvs add' (it will fake an `add' if you don't have write
+permission yet).  Then you can use `cvs diff -N' to generate the
+patch.  See http://www.red-bean.com/cvsutils/
+