diff --git a/tutorial/tutorial.wmml b/tutorial/tutorial.wmml
index 4e1e168d181192a5d6275c37b4269d9c798a0859..ecd52a9757b3c2799702b5602c50524464c41d06 100644
--- a/tutorial/tutorial.wmml
+++ b/tutorial/tutorial.wmml
@@ -5251,6 +5251,9 @@ Result: ({ /* 4 elements */
     4
 })
 </man_example>
+<man_note>
+This function is only available in Pike 0.6 and later.
+</man_note>
 <man_see>
 Array.diff, Array.diff_compare_table
 </man_see>