diff --git a/c_tools/stacking/pruneVoids.ggo b/c_tools/stacking/pruneVoids.ggo
index 1d85aa6..a61f3a2 100644
--- a/c_tools/stacking/pruneVoids.ggo
+++ b/c_tools/stacking/pruneVoids.ggo
@@ -21,6 +21,8 @@ option "numVoids" - "Number of voids" int required
 
 option "isObservation" - "We are working with observational data" flag off
 
+option "useLCDM" - "Void positions are in comoving coordinates" flag off
+
 option "zMin" - "Minimum redshift of sample" double optional default="0.0"
 option "zMax" - "Maximum redshift of sample" double optional default="10.0"