diff --git a/README.md b/README.md
index 1a483c8..3d5716d 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,4 @@
 # IRRemote
+
+Modified from PJRC for Particle Photon.
+https://www.pjrc.com/teensy/arduino_libraries/IRremote.zip