diff --git a/Socialmetrica.package/Integer.extension/instance/periodsSince.until..st b/Socialmetrica.package/Integer.extension/instance/periodsSince.until..st
index 9f71e5d..9fa7d10 100644
--- a/Socialmetrica.package/Integer.extension/instance/periodsSince.until..st
+++ b/Socialmetrica.package/Integer.extension/instance/periodsSince.until..st
@@ -1,11 +1,11 @@
 *Socialmetrica
 periodsSince: startingDate until: endingDate
-	| endings subperiodDuration |
+	| borders subperiodDuration |
 	subperiodDuration := (endingDate - startingDate) / self.
-	endings := OrderedCollection new.
-	endings add: startingDate.
+	borders := OrderedCollection new.
+	borders add: startingDate.
 	1 to: self do: [ :i | | ending |
 		ending := startingDate + (subperiodDuration * i).
-		endings add:  ending.
+		borders add:  ending.
 	].
-	^ endings
\ No newline at end of file
+	^ borders
\ No newline at end of file