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-rw-r--r--exercises/005_arrays2.zig5
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diff --git a/exercises/005_arrays2.zig b/exercises/005_arrays2.zig
index c5df8d4..497d400 100644
--- a/exercises/005_arrays2.zig
+++ b/exercises/005_arrays2.zig
@@ -11,6 +11,11 @@
//
// const d = [_]u8{ 1,2,3 } ** 2; // equals 1 2 3 1 2 3
//
+// Note that both '++' and '**' only operate on arrays while your
+// program is _being compiled_. This special time is known in Zig
+// parlance as "comptime" and we'll learn plenty more about that
+// later.
+//
const std = @import("std");
pub fn main() void {