diff --git a/src/daemon-ctrl.js b/src/daemon-ctrl.js
index 6afa653e..0ee0b8ad 100644
--- a/src/daemon-ctrl.js
+++ b/src/daemon-ctrl.js
@@ -81,7 +81,8 @@ class DaemonController {
    * - `disposable` bool - a new repo is created and initialized for each invocation
    * - `config` - ipfs configuration options
    * - `args` - array of cmd line arguments to be passed to ipfs daemon
-   * - `exec` - path to the desired IPFS executable to spawn
+   * - `exec` string (optional) - path to the desired IPFS executable to spawn,
+   * this will override the `exec` set when creating the daemon controller factory instance
    *
    * @param {Object} [opts={}] - various config options and ipfs config parameters
    * @param {Function} callback(err, [`ipfs-api instance`, `Node (ctrl) instance`]) - a callback that receives an array with an `ipfs-instance` attached to the node and a `Node`