diff --git a/exercises/076_sentinels.zig b/exercises/076_sentinels.zig
index 4c16e7c..476f03f 100644
--- a/exercises/076_sentinels.zig
+++ b/exercises/076_sentinels.zig
@@ -35,6 +35,9 @@
 // many-item pointer without knowing its length. (We CAN'T do
 // that with regular many-item pointers!).
 //
+// Important: the sentinel value must be of the same type as the
+// data being termined!
+//
 const print = @import("std").debug.print;
 
 pub fn main() void {