add ATAN/ATAN2 link

diff --git a/ztrans_proposal.mdwn b/ztrans_proposal.mdwn
index bf2c0aede655d8e56c1e2b507fbf25360c0528cb..70d9247cc820e9b272a4bfad9f636bac1d78ba7b 100644 (file)
--- a/ztrans_proposal.mdwn
+++ b/ztrans_proposal.mdwn
@@ -195,6 +195,9 @@ a decision
 
 # ATAN / ATAN2 commentary
 
+Discussion starts here:
+<http://lists.libre-riscv.org/pipermail/libre-riscv-dev/2019-August/002470.html>
+
 from Mitch Alsup:
 
 would like to point out that the general implementations of ATAN2 do a