diff --git a/notes.md b/notes.md
index 73122ff..60f061e 100644
--- a/notes.md
+++ b/notes.md
@@ -229,3 +229,4 @@
 2019-12-19T22:13:00 - Implementing approach from a new paper read last night (pulp-runtime)
 2019-12-19T18:44:00 - Late-night bugfix on financial RL environment (pulp-runtime)
 2019-12-19T04:30:00 - Implementing approach from a new paper read last night (pulp-runtime)
+2019-12-19T08:36:00 - Experimenting with FPGA constraints (source: Trimberger 'Three Ages of FPGAs') (pulp-runtime)