diff --git a/prelude.md b/prelude.md
index bfb91c4..96f0f9c 100644
--- a/prelude.md
+++ b/prelude.md
@@ -1133,12 +1133,13 @@ Converts an angle in radians to an angle in turns.
 
 ---
 ### random
-Returns a random something. With zero arguments, returns a random number between 0 (inclusive) and 1 (exclusive). With one argument, returns a random number between 0 and n. With two arguments, returns a random number between m and n. Alternately, given a collection (list, dict, set), it returns a random member of that collection.
+Returns a random something. With zero arguments, returns a random number between 0 (inclusive) and 1 (exclusive). With one argument, returns a random number between 0 and n. With two arguments, returns a random number between m and n. Alternately, given a collection (tuple, list, dict, set), it returns a random member of that collection.
 ```
 ()
 (n as :number)
 (m as :number, n as :number)
 (l as :list)
+(t as :tuple)
 (d as :dict)
 (s as :set)
 ```