diff --git a/array.go b/array.go
index 10f036f..6917c7b 100644
--- a/array.go
+++ b/array.go
@@ -5,13 +5,15 @@ import (
 )
 
 // First() reduces the set of matched elements to the first in the set.
-// It returns a new Selection object.
+// It returns a new Selection object, and an empty Selection object if the
+// the selection is empty.
 func (this *Selection) First() *Selection {
 	return this.Eq(0)
 }
 
 // Last() reduces the set of matched elements to the last in the set.
-// It returns a new Selection object.
+// It returns a new Selection object, and an empty Selection object if
+// the selection is empty.
 func (this *Selection) Last() *Selection {
 	return this.Eq(-1)
 }