diff --git a/notes.md b/notes.md
index 0fa4cc6..b63eda7 100644
--- a/notes.md
+++ b/notes.md
@@ -229,3 +229,4 @@
 2021-01-28T17:59:00 - Late-night bugfix on financial RL environment (prophet)
 2021-01-28T04:44:00 - Refactor for clarity, might break a few tests though (prophet)
 2021-02-07T18:15:00 - Late-night bugfix on financial RL environment (prophet)
+2021-02-07T22:11:00 - Experimenting with FPGA constraints (source: Trimberger 'Three Ages of FPGAs') (prophet)