diff --git a/parity/rpc.rs b/parity/rpc.rs
index 09d72c136..0bc1c14e2 100644
--- a/parity/rpc.rs
+++ b/parity/rpc.rs
@@ -304,6 +304,8 @@ pub fn new_ipc<D: rpc_apis::Dependencies>(
 	let handler = setup_apis(conf.apis, dependencies);
 	let remote = dependencies.remote.clone();
 	let path = PathBuf::from(&conf.socket_addr);
+	// Make sure socket file can be created on unix-like OS.
+	// Windows pipe paths are not on the FS.
 	if !cfg!(windows) {
 		if let Some(dir) = path.parent() {
 			::std::fs::create_dir_all(&dir)
diff --git a/rust-toolchain b/rust-toolchain
new file mode 100644
index 000000000..2bf5ad044
--- /dev/null
+++ b/rust-toolchain
@@ -0,0 +1 @@
+stable