diff --git a/pos.go b/position.go
similarity index 100%
rename from pos.go
rename to position.go
diff --git a/pos_test.go b/position_test.go
similarity index 100%
rename from pos_test.go
rename to position_test.go
diff --git a/stackedbarchart.go b/stacked_barchart.go
similarity index 100%
rename from stackedbarchart.go
rename to stacked_barchart.go
diff --git a/helper.go b/utils.go
similarity index 100%
rename from helper.go
rename to utils.go
diff --git a/helper_test.go b/utils_test.go
similarity index 100%
rename from helper_test.go
rename to utils_test.go