diff --git a/src/hash/md2.rs b/src/hash/md2.rs
index 2edd7f9..6cbbc1d 100644
--- a/src/hash/md2.rs
+++ b/src/hash/md2.rs
@@ -43,9 +43,9 @@ fn checksum(message: impl AsRef<[u8]>) -> Vec<u8> {
     message
 }
 
-/// Computes the MD2 digest of the input bytes.
+/// Computes the MD2 hash value (digest) of the input bytes.
 ///
-/// Returns a `Digest<16>` which implements `Display` in order to get at hexadecimal-string representation.
+/// Returns a 16-byte `Digest` which implements `Display` in order to get at hexadecimal-string representation.
 ///
 /// # Examples
 ///
diff --git a/src/hash/md4.rs b/src/hash/md4.rs
index e1242d4..54de653 100644
--- a/src/hash/md4.rs
+++ b/src/hash/md4.rs
@@ -65,9 +65,9 @@ fn step([mut a, b, c, d]: [u32; 4], words: &[u32], i: usize) -> [u32; 4] {
     [a, b, c, d]
 }
 
-/// Computes the MD4 digest of the input bytes.
+/// Computes the MD4 hash value (digest) of the input bytes.
 ///
-/// Returns a `Digest<16>` which implements `Display` in order to get at hexadecimal-string representation.
+/// Returns a 16-byte `Digest` which implements `Display` in order to get at hexadecimal-string representation.
 ///
 /// # Examples
 ///
diff --git a/src/hash/md5.rs b/src/hash/md5.rs
index 13b043e..13edb5a 100644
--- a/src/hash/md5.rs
+++ b/src/hash/md5.rs
@@ -54,9 +54,9 @@ fn step([mut a, b, c, d]: [u32; 4], words: &[u32], index: usize) -> [u32; 4] {
     [a, b, c, d]
 }
 
-/// Computes the MD5 digest of the input bytes.
+/// Computes the MD5 hash value (digest) of the input bytes.
 ///
-/// Returns a `Digest<16>` which implements `Display` in order to get at hexadecimal-string representation.
+/// Returns a 16-byte `Digest` which implements `Display` in order to get at hexadecimal-string representation.
 ///
 /// # Examples
 ///
diff --git a/src/hash/sha1.rs b/src/hash/sha1.rs
index 715484c..8951fad 100644
--- a/src/hash/sha1.rs
+++ b/src/hash/sha1.rs
@@ -1,6 +1,6 @@
 use crate::hash::{bytes_to_words_be, words_to_bytes_be, Digest};
 
-// based on RFC3174, US Secure Hash Algorithm 1
+// based on RFC3174, Secure Hash Algorithm 1
 
 // round functions
 const F1: fn(u32, u32, u32) -> u32 = |x, y, z| (x & y) | ((!x) & z);
@@ -61,9 +61,9 @@ fn step([a, b, c, d, e]: [u32; 5], words: &[u32], i: usize) -> [u32; 5] {
     ]
 }
 
-/// Computes the SHA1 digest of the input bytes.
+/// Computes the SHA1 hash value (digest) of the input bytes.
 ///
-/// Returns a 20-byte long `Digest` which implements `Display` in order to get at hexadecimal-string representation.
+/// Returns a 20-byte `Digest` which implements `Display` in order to get at hexadecimal-string representation.
 ///
 /// # Examples
 ///