diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index e2f1359..ffaaeff 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -1220,30 +1220,40 @@ impl BitBuffer {
 
 /*---- Miscellaneous values ----*/
 
+/// A number between 1 and 40 (inclusive).
 #[derive(Copy, Clone)]
 pub struct Version(u8);
 
 impl Version {
+	/// Creates a version object from the given number.
+	/// 
+	/// Panics if the number is outside the range [1, 40].
 	pub fn new(ver: u8) -> Self {
 		assert!(QrCode_MIN_VERSION.value() <= ver && ver <= QrCode_MAX_VERSION.value(), "Version number out of range");
 		Version(ver)
 	}
 	
+	/// Returns the value, which is in the range [1, 40].
 	pub fn value(&self) -> u8 {
 		self.0
 	}
 }
 
 
+/// A number between 0 and 7 (inclusive).
 #[derive(Copy, Clone)]
 pub struct Mask(u8);
 
 impl Mask {
+	/// Creates a mask object from the given number.
+	/// 
+	/// Panics if the number is outside the range [0, 7].
 	pub fn new(mask: u8) -> Self {
 		assert!(mask <= 7, "Mask value out of range");
 		Mask(mask)
 	}
 	
+	/// Returns the value, which is in the range [0, 7].
 	pub fn value(&self) -> u8 {
 		self.0
 	}