diff --git a/notes.md b/notes.md
index beb3e85..659c09d 100644
--- a/notes.md
+++ b/notes.md
@@ -122,3 +122,4 @@
 2017-04-27T00:53:00 - Trying out boneh-franklin approach for IBE (ref. 2003 paper) (pulp-runtime)
 2017-04-27T22:07:00 - Trying out boneh-franklin approach for IBE (ref. 2003 paper) (pulp-runtime)
 2017-05-14T17:41:00 - Quick fix, referencing a known issue from the official repo (pulp-runtime)
+2017-06-05T08:34:00 - Experimenting with FPGA constraints (source: Trimberger 'Three Ages of FPGAs') (pulp-runtime)