diff --git a/bazel/properties.go b/bazel/properties.go
index a71b12b..3e778bb 100644
--- a/bazel/properties.go
+++ b/bazel/properties.go
@@ -160,6 +160,14 @@
 	return labels
 }
 
+// Appends two LabelLists, returning the combined list.
+func AppendBazelLabelLists(a LabelList, b LabelList) LabelList {
+	var result LabelList
+	result.Includes = append(a.Includes, b.Includes...)
+	result.Excludes = append(a.Excludes, b.Excludes...)
+	return result
+}
+
 // Subtract needle from haystack
 func SubtractBazelLabelList(haystack LabelList, needle LabelList) LabelList {
 	var result LabelList