diff --git a/Cargo.toml b/Cargo.toml
index 2371ee6..4ebdd46 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,6 +20,15 @@ travis-ci = { repository = "https://github.com/0xAtropine/Winternitz-OTS", branc
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+# Data Format
 hex = "0.4.2"
-getrandom = "0.1.14"
+
+# Randomness
+# Was 0.1.4
+getrandom = "0.2.2"
+
+# Crypto
 blake2-rfc = "0.2.18"
+
+# Serialization
+serde = { version = "1.0", features = ["derive"] }
\ No newline at end of file
diff --git a/src/wots.rs b/src/wots.rs
index 0ad8f33..5a232d4 100644
--- a/src/wots.rs
+++ b/src/wots.rs
@@ -5,7 +5,7 @@ use getrandom;
 
 /// # W-OTS Keypair
 /// This struct contains the W-OTS Keypair, including:
-/// - w: The Wintertnitz Parameter, as a usize
+/// - w: The Wintertnitz Parameter, as a usize. It should be 4 or 16.
 /// - n: The Digest Length in Bytes, as a usize
 /// - pk: The Public Key, as a Vector of Strings
 /// - sk: The Private Key, as a Vector of Strings