diff --git a/Cargo.toml b/Cargo.toml
index b78c6514..b744f1fc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,6 @@ crossbeam-utils = { version = "0.6.6", default-features = false }
 futures-channel-preview = "0.3.0-alpha.18"
 futures-core-preview = "0.3.0-alpha.18"
 futures-util-preview = "0.3.0-alpha.18"
-hex = { version = "0.3.2", default-features = false }
 log = "0.4.8"
 md-5 = "0.8.0"
 memchr = "2.2.1"
diff --git a/src/lib.rs b/src/lib.rs
index 2a959f5a..809185c3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -43,8 +43,13 @@ pub use self::{
 #[cfg(feature = "mariadb")]
 pub mod mariadb;
 
+#[cfg(feature = "mariadb")]
+#[doc(inline)]
+pub use mariadb::MariaDb;
+
 #[cfg(feature = "postgres")]
 pub mod postgres;
 
 #[cfg(feature = "postgres")]
+#[doc(inline)]
 pub use self::postgres::Postgres;
diff --git a/src/postgres/protocol/password_message.rs b/src/postgres/protocol/password_message.rs
index 254dfc1d..8ace172b 100644
--- a/src/postgres/protocol/password_message.rs
+++ b/src/postgres/protocol/password_message.rs
@@ -34,12 +34,12 @@ impl Encode for PasswordMessage<'_> {
                 hasher.input(password);
                 hasher.input(user);
 
-                let credentials = hex::encode(hasher.result_reset());
+                let credentials = format!("{:x}", hasher.result_reset());
 
                 hasher.input(credentials);
                 hasher.input(salt);
 
-                let salted = hex::encode(hasher.result());
+                let salted = format!("{:x}", hasher.result());
 
                 // len + "md5" + (salted)
                 buf.put_u32::<NetworkEndian>((4 + 3 + salted.len() + 1) as u32);