Add some comments

src/mod65537.rs

@@ -19,6 +19,8 @@ use crate::schnorr::{SchnorrPublicKey, SchnorrSignature};
 
 type GoldF = GoldilocksField;
 
+// Helper function to constrain r = a % 65537 in a plonky2 circuit.
+
 #[derive(Debug, Default)]
 pub struct Mod65537Generator {
     a: Target,

src/schnorr.rs

@@ -8,6 +8,13 @@ use rand::Rng;
 
 const BIG_GROUP_GEN: GoldilocksField = GoldilocksField(14293326489335486720);
 
+// No ZK here.
+// This is just a simple implementation of Schnorr signatures:
+// keygen, sign, and verify.
+
+// 8-bit security (i.e. totally insecure, DO NOT USE if you want any security at all)
+// because it uses the multiplicative group of the Goldilocks field
+
 #[derive(Copy, Clone, Debug)]
 pub struct SchnorrSigner {
     PRIME_GROUP_GEN: GoldilocksField,

src/schnorr_prover.rs

@@ -21,6 +21,12 @@ use crate::{
 
 type GoldF = GoldilocksField;
 
+// Functions to verify a Schnorr signature in a plonky2 circuit.
+
+// 8-bit security (i.e. totally insecure, DO NOT USE if you want any security at all)
+// because it uses the multiplicative group of the Goldilocks field
+// This is intended solely as a proof of concept.
+
 pub struct MessageTarget {
     msg: Vec<Target>,
 }