Document NegotiateSsl impl for SslContext

Author: sfackler

.travis.yml

@@ -10,7 +10,7 @@ before_script:
 script:
 - cargo test
 - cargo test --features "uuid rustc-serialize time unix_socket serde chrono openssl"
-- cargo doc --no-deps --features "unix_socket"
+- cargo doc --no-deps --features "unix_socket openssl"
 after_success:
   - test $TRAVIS_PULL_REQUEST == "false" && test $TRAVIS_BRANCH == "master" && test $TRAVIS_RUST_VERSION == "nightly" && ./.travis/update_docs.sh
 env:

src/io/mod.rs

@@ -17,6 +17,9 @@ pub trait StreamWrapper: Read+Write+Send {
 }
 
 /// A trait implemented by types that can negotiate SSL over a Postgres stream.
+///
+/// If the `openssl` Cargo feature is enabled, this trait will be implemented
+/// for `openssl::ssl::SslContext`.
 pub trait NegotiateSsl {
     /// Negotiates an SSL session, returning a wrapper around the provided
     /// stream.