diff --git a/NAMESPACE b/NAMESPACE
index 3c6090395b4043edcc5927e81039cf53e504c8d5..c9ffa9a41a28c7491674747c23a73e85b51429a4 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -17,3 +17,4 @@ importFrom(graphics,par)
 importFrom(lifecycle,deprecate_soft)
 importFrom(rgl,plot3d)
 importFrom(stats,rchisq)
+importFrom(utils,combn)