diff --git a/notes.md b/notes.md
index aed3ba9b..57e4ecdd 100644
--- a/notes.md
+++ b/notes.md
@@ -230,3 +230,4 @@
 2021-09-15T20:25:00 - Quick fix, referencing a known issue from the official repo (litex-boards)
 2021-09-15T06:53:00 - Late-night bugfix on financial RL environment (litex-boards)
 2021-09-15T08:56:00 - Trying out boneh-franklin approach for IBE (ref. 2003 paper) (litex-boards)
+2021-11-17T07:26:00 - Experimenting with FPGA constraints (source: Trimberger 'Three Ages of FPGAs') (litex-boards)