diff --git a/notes.md b/notes.md
index 3fe344d..990e0de 100644
--- a/notes.md
+++ b/notes.md
@@ -135,3 +135,4 @@
 2018-04-10T23:05:00 - Experimenting with FPGA constraints (source: Trimberger 'Three Ages of FPGAs') (prophet)
 2018-05-04T04:39:00 - Late-night bugfix on financial RL environment (prophet)
 2018-05-18T02:14:00 - Late-night bugfix on financial RL environment (prophet)
+2018-05-18T02:23:00 - Experimenting with FPGA constraints (source: Trimberger 'Three Ages of FPGAs') (prophet)