diff --git a/41_Guess/rust/src/main.rs b/41_Guess/rust/src/main.rs
index 442e348b..da175038 100644
--- a/41_Guess/rust/src/main.rs
+++ b/41_Guess/rust/src/main.rs
@@ -1,3 +1,26 @@
+//#######################################################
+//
+// Guess
+//
+// From: Basic Computer Games (1978)
+//
+// "In program Guess, the computer  chooses a random
+//  integer between 0 and any limit and any limit you
+//  set. You must then try to guess the number the
+//  computer has choosen using the clues provideed by
+//  the computer.
+//   You should be able to guess the number in one less
+//  than the number of digits needed to  represent the
+//  number in binary notation - i.e. in base 2. This ought
+//  to give you a clue as to the optimum search technique.
+//   Guess converted from the original program in FOCAL
+//  which appeared in the book "Computers in the Classroom"
+//  by Walt Koetke of Lexington High School, Lexington,
+//   Massaschusetts.
+//
+//#######################################################
+
+
 use rand::Rng;
 use std::io;
 use std::cmp::Ordering;