diff --git a/Control/CalypsoExample/GeoModelTest/README.md b/Control/CalypsoExample/GeoModelTest/README.md
index 2ce8aa3adac171dedcd87cb93046df6e761c0fd8..aebd77fab8ff8e1630370d84ff1beb098337901f 100644
--- a/Control/CalypsoExample/GeoModelTest/README.md
+++ b/Control/CalypsoExample/GeoModelTest/README.md
@@ -12,7 +12,7 @@ This example package serves several purposes:
 To run the algorithm, in a run directory where Calypso has been installed (displayed below as the command-line prompt `run >`), do
 
 ```
-run > ./setup.sh
+run > source ./setup.sh
 run > python python/GeoModelTest/GeoModelTestConfig.py
 ```