diff --git a/Calibrations.md b/Calibrations.md
index d19e51b..3177aec 100644
--- a/Calibrations.md
+++ b/Calibrations.md
@@ -1,6 +1,7 @@
 ##### Probe semi-angle
 
-##### PAAR - 
+##### PAAR - Pumping Aperture Angular Restriction
+
 
 ##### Detector camera length
 Pixelated STEM detector is located at a different position compared to level of nominal camera length (dedicated STEM detectors in our case). Real camera length to the pixelated detector has to be measured for each available nominal camera length. Otherwise wrong detector cover angle is used in reconstructions.