diff --git a/exec/global_cor_heatmap_example.R b/exec/global_cor_heatmap_example.R
index 01d31f5..215865a 100644
--- a/exec/global_cor_heatmap_example.R
+++ b/exec/global_cor_heatmap_example.R
@@ -6,6 +6,7 @@ source("../R/columnSelector.R")
 source("../R/transformation.R")
 source("../R/global_cor_heatmap.R")
 source("../R/limit.R")
+source("../R/global.R")
 
 # test data
 data <- data.table::as.data.table(mtcars, keep.rowname = "id")