diff --git a/doc.md b/doc.md
index e33a016be9abd02f0b8adafad3d512681a6a509d..dc496262263482c6b4d380eaf46ccef93c0c2074 100644
--- a/doc.md
+++ b/doc.md
@@ -36,4 +36,5 @@ NRST, should it be connected?
 
 openocd -f interface/stlink-v2-1.cfg -f target/lpc17xx.cfg -c "init; reset halt"
 
-* UM10360 
+* UM10360 data sheet for lpc1769
+