diff --git a/doc/9-guides/README.md b/doc/9-guides/README.md
index aa6d5cbf6..4c805940a 100644
--- a/doc/9-guides/README.md
+++ b/doc/9-guides/README.md
@@ -4,4 +4,8 @@ here is a small collection of useful tricks and techniques to really make Furnac
 
 - [using samples with limited playback rates](limited-samples.md)
 - [choosing emulation cores](emulation-cores.md)
-- [guide on using OPLL patch macro](opllswitching.md)
\ No newline at end of file
+- [guide on using OPLL patch macro](opllswitching.md)
+
+# links
+
+- [FM Synthesis of Real Instruments](http://www.javelinart.com/FM_Synthesis_of_Real_Instruments.pdf): an in-depth tutorial on creating FM patches from scratch.