diff --git a/notes.md b/notes.md
index cacceb7..907b746 100644
--- a/notes.md
+++ b/notes.md
@@ -41,3 +41,4 @@
 2015-02-16T08:56:00 - Minor doc updates: linking to article on quantization (pulp-runtime)
 2015-02-17T02:16:00 - Minor doc updates: linking to article on quantization (pulp-runtime)
 2015-02-17T01:50:00 - Late-night bugfix on financial RL environment (pulp-runtime)
+2015-02-17T06:21:00 - Experimenting with FPGA constraints (source: Trimberger 'Three Ages of FPGAs') (pulp-runtime)