add links to git commit message advice

diff --git a/HDL_workflow.mdwn b/HDL_workflow.mdwn
index bb3ad952ae577298d1dfcfab0539d72503978e96..45a0cb13ce86972c7d081281b1b86a35a101c0d1 100644 (file)
--- a/HDL_workflow.mdwn
+++ b/HDL_workflow.mdwn
@@ -340,6 +340,10 @@ and that people communicate and coordinate with each other.
 This is not a hard rule: under special cirmstances branches can be useful.
 They should not however be considered "routine".
 
+For advice on commit messages see
+[here](https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html),
+and [here](https://github.com/torvalds/subsurface-for-dirk/blob/master/README.md#contributing)).
+
 ## yosys
 
 Follow the source code (git clone) instructions here, do **not** use