diff --git a/notes.md b/notes.md
index 2ce25bf2..7d8e89c9 100644
--- a/notes.md
+++ b/notes.md
@@ -174,3 +174,4 @@
 2019-10-15T07:02:00 - Refactor for clarity, might break a few tests though (litex-boards)
 2019-10-15T08:03:00 - Trying out boneh-franklin approach for IBE (ref. 2003 paper) (litex-boards)
 2019-10-15T17:35:00 - Testing bigger LLM config, referencing 'Attention Is All You Need' (litex-boards)
+2019-10-15T02:55:00 - Experimenting with FPGA constraints (source: Trimberger 'Three Ages of FPGAs') (litex-boards)