Merge commit '92f9d78ecdcd2ee53ac7519c19c91cdd71122d22'

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --combined diziet-utils/README.md
index 0f6f097781a9d7efd47fe1d594d6ce4a9c070e82,ec4c50d5f995c68cf23c37daa97df065e7c8f4e4..ec4c50d5f995c68cf23c37daa97df065e7c8f4e4
--- 1/diziet-utils/README.md
--- 2/README.md
+++ b/diziet-utils/README.md
@@@ -5,6 -5,20 +5,20 @@@ This is a set of files I use for makin
  It mostly consists of my own work, but occasionally I include other
  people's work if that other work has a suitable licence.
  
+ # How to use
+ 
+ To add to your project:
+ 
+ ```
+ git subtree add -P diziet-utils https://salsa.debian.org/iwj/3d-utils.git main
+ ```
+ 
+ To update to a new version:
+ 
+ ```
+ git subtree pull -P diziet-utils https://salsa.debian.org/iwj/3d-utils.git main
+ ```
+ 
  # Licence
  
  Everything is GPLv3+ (or compatible).