diff --git a/NAMESPACE b/NAMESPACE
index 3596a04..06e32cd 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -75,6 +75,7 @@
 importFrom(plotly,ggplotly)
 importFrom(purrr,map_dfr)
 importFrom(stats,prop.test)
+importFrom(tibble,add_column)
 importFrom(tibble,as_tibble)
 importFrom(tibble,remove_rownames)
 importFrom(tibble,rownames_to_column)