diff --git a/myacronyms.txt b/myacronyms.txt
index b2c68ff..8ca334b 100644
--- a/myacronyms.txt
+++ b/myacronyms.txt
@@ -6,3 +6,4 @@
 # Example:
 #   MIA:Missing In Action
 CAB:Calibration Acceptance Board
+PTC:Photon Transfer Curve