diff --git a/yarn-project/foundation/src/crypto/random/randomness_singleton.ts b/yarn-project/foundation/src/crypto/random/randomness_singleton.ts
index f4d70f15f1f..fcdba51772d 100644
--- a/yarn-project/foundation/src/crypto/random/randomness_singleton.ts
+++ b/yarn-project/foundation/src/crypto/random/randomness_singleton.ts
@@ -52,6 +52,8 @@ export class RandomnessSingleton {
     }
     const result = Buffer.alloc(length);
     for (let i = 0; i < length; i++) {
+      // Each byte of the buffer is set to a 1 byte of this.counter's value. 0xff is 255 in decimal and it's used as
+      // a mask to get the last 8 bits of the shifted counter.
       result[i] = (this.counter >> (i * 8)) & 0xff;
     }
     this.counter++;