diff --git a/src/classes/validationsingle.gd b/src/classes/validationsingle.gd
index 5bc337b..10eb244 100644
--- a/src/classes/validationsingle.gd
+++ b/src/classes/validationsingle.gd
@@ -144,6 +144,9 @@ func evaluate() -> bool:
 					logger.warn("Can't determine if data contains values as data is not of type String or StringName")
 					continue
 				
+				# Set 'minimum_matches' to the amount of values if set to '-1'
+				if rule["minimum_matches"] == -1: rule["minimum_matches"] = rule["values"].size()
+				
 				var successes: int = 0
 				for value in rule["values"]:
 					if data.contains(value):
@@ -277,7 +280,7 @@ func has_values(values: Array) -> CoreValidationSingle:
 	rules.append({ "type": CoreTypes.ValidationType.HAS_VALUES, "values": values })
 	return self
 
-## Ensures that [param data] contains at least <[code]minimum_matches[/code]> values.[br]
+## Ensures that [param data] contains at least <[code]minimum_matches[/code]> (or all if set to [code]-1[/code]) values.[br]
 ## Applies to [String] & [StringName].
 func contains(values: Array[String], minimum_matches: int = 1) -> CoreValidationSingle:
 	rules.append({ "type": CoreTypes.ValidationType.HAS_VALUES, "values": values, "minimum_matches": minimum_matches })