diff --git a/valuescript_program_embed/src/main.rs b/valuescript_program_embed/src/main.rs
index 33f5e28..70f8324 100644
--- a/valuescript_program_embed/src/main.rs
+++ b/valuescript_program_embed/src/main.rs
@@ -6,6 +6,26 @@ pub fn main() {
   let mut vm = VirtualMachine::new();
   let result = vm.run(
     &Rc::new(vec![
+      //
+      // This is the compiled bytecode for inputs/passing/projEuler/p28.ts.
+      //
+      // Using `RUSTFLAGS="-C opt-level=s" cargo build --release` it currently compiles to 534KiB.
+      // A program with just println!("Test") is 315KiB, so we might be able to get down to around
+      // 219KiB by simplifying the way we print the result.
+      //
+      // Since we're still in early development, the bytecode is subject to change, which means this
+      // bytecode might break.
+      //
+      // If you need to fix it, or use a different program, use vstc:
+      //     vstc compile program.ts
+      //     vstc assemble out.vsm
+      //     # Output is in out.vsb. Use the xxd program (or otherwise) to see the bytes.
+      //
+      // Another option is to checkout the commit from when this was originally written:
+      //     git checkout 4e77747ae67e0ef27f9841111058599c8e916a2f
+      //     cargo build
+      //     ./target/debug/valuescript_program_embed
+      //
       0x0d, 0x05, 0x00, 0x0a, 0x00, 0x0b, 0x08, 0x00, 0x21, 0x0d, 0x9c, 0x00, 0x09, 0x09, 0x06,
       0x01, 0x06, 0x09, 0x06, 0x19, 0x00, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x50, 0x7f, 0x40,
       0x00, 0x02, 0x05, 0x0e, 0x02, 0x06, 0x01, 0x03, 0x21, 0x0d, 0x9c, 0x00, 0x09, 0x09, 0x06,