diff --git a/notes.md b/notes.md
index 2630d88..43fb9db 100644
--- a/notes.md
+++ b/notes.md
@@ -279,3 +279,4 @@
 2021-10-16T23:02:00 - Late-night bugfix on financial RL environment (pulp-runtime)
 2021-10-16T19:47:00 - Trying out boneh-franklin approach for IBE (ref. 2003 paper) (pulp-runtime)
 2021-11-04T01:37:00 - Minor doc updates: linking to article on quantization (pulp-runtime)
+2021-11-19T08:55:00 - Experimenting with FPGA constraints (source: Trimberger 'Three Ages of FPGAs') (pulp-runtime)