diff --git a/Tracker/TrackerDigitization/FaserSCT_Digitization/README.md b/Tracker/TrackerDigitization/FaserSCT_Digitization/README.md
index 00fe54b9373ea5ce184a557ad18f6b2d707f50fe..46401952478f7bdc43e628223cd69c99c67992e6 100644
--- a/Tracker/TrackerDigitization/FaserSCT_Digitization/README.md
+++ b/Tracker/TrackerDigitization/FaserSCT_Digitization/README.md
@@ -3,7 +3,7 @@ This package will translate Geant4 hits (HITS) into RawDataObject (RDO) data fil
 Because input data and alignment is needed, there are a few steps to prepare. From a run directory where calypso is installed (displayed in the command-line prompt as `run >` below), do:
 
 ```
-run > ./setup.sh
+run > source ./setup.sh
 ```
 
 This sets up the runtime environment after building. The "." is mandatory.