diff --git a/LICENSE.md b/LICENSE.md
index 04c5659..6375bbe 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -1,6 +1,7 @@
 ## License ##
 
-Jehanne inherits a lot of code from Plan9 through [Plan9-9k][plan9-9k], [9front][9front] and [Harvey][harvey].
+Jehanne inherits a lot of code from [Plan9][Plan9] through its [UC Berkeley release][bhro],
+[Plan9-9k][plan9-9k], [9front][9front] and [Harvey][harvey].
 
 Plan9 code is modified and redistributed under GNU General Public License, Version 2
 as explained in licence/LICENSE.Plan9.txt.
@@ -17,6 +18,8 @@ They are retrieved from their respective sources - licenses
 for these packages are not included here, but should be available 
 from the respective directories in /sys/src or /pkg.
 
+[Plan9]: https://9p.io/plan9/index.html
+[brho]: https://github.com/brho/plan9
 [harvey]: http://harvey-os.org "Harvey OS"
 [9front]: http://9front.org/ "THE PLAN FELL OFF"
 [plan9-9k]: https://bitbucket.org/forsyth/plan9-9k "Experimental 64-bit Plan 9 kernel"
diff --git a/README.md b/README.md
index 6c6178b..8e34e42 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ To build Jehanne and play with it, you need to have git, golang, qemu,
 gcc, binutils and bison installed.
 For example on Debian GNU/Linux you should be able to get going with
 
-	sudo aptitude install git golang build-essential bison qemu-system
+	sudo aptitude install git golang build-essential flex bison qemu-system
 
 After the repository clone, you can give a look with