diff --git a/Cargo.toml b/Cargo.toml
index e8412c9..d9fb76a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 
 name = "lmdb"
+# NB: When modifying, also modify html_root_url in lib.rs
 version = "0.6.0"
 authors = ["Dan Burkert <dan@danburkert.com>"]
 license = "Apache-2.0"
diff --git a/lmdb-sys/Cargo.toml b/lmdb-sys/Cargo.toml
index 6f625f1..67b12f3 100644
--- a/lmdb-sys/Cargo.toml
+++ b/lmdb-sys/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 
 name = "lmdb-sys"
+# NB: When modifying, also modify html_root_url in lib.rs
 version = "0.6.0"
 authors = ["Dan Burkert <dan@danburkert.com>"]
 license = "Apache-2.0"
diff --git a/lmdb-sys/src/lib.rs b/lmdb-sys/src/lib.rs
index 92e681a..55d1a2c 100644
--- a/lmdb-sys/src/lib.rs
+++ b/lmdb-sys/src/lib.rs
@@ -1,4 +1,6 @@
 #![allow(non_camel_case_types)]
+#![deny(warnings)]
+#![doc(html_root_url = "https://docs.rs/lmdb-sys/0.6.0")]
 
 extern crate libc;
 
diff --git a/src/lib.rs b/src/lib.rs
index 60533f3..442b558 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,6 +2,8 @@
 //! [Symas Lightning Memory-Mapped Database (LMDB)](http://symas.com/mdb/).
 
 #![cfg_attr(test, feature(test))]
+#![deny(warnings)]
+#![doc(html_root_url = "https://docs.rs/lmdb/0.6.0")]
 
 extern crate libc;
 extern crate lmdb_sys as ffi;