diff --git a/src/nodejs/node_osrm.cpp b/src/nodejs/node_osrm.cpp
index 37944d60c..b04b81d87 100644
--- a/src/nodejs/node_osrm.cpp
+++ b/src/nodejs/node_osrm.cpp
@@ -55,8 +55,8 @@ NAN_MODULE_INIT(Engine::Init)
 // clang-format off
 /**
  * The `OSRM` method is the main constructor for creating an OSRM instance.
- * An OSRM instance requires a `.osrm` dataset, which is prepared by the OSRM toolchain.
- * You can create such a `.osrm` file by running the OSRM binaries we ship in `node_modules/osrm/lib/binding/` and default
+ * An OSRM instance requires a `.osrm.*` dataset(`.osrm.*` because it contains several files), which is prepared by the OSRM toolchain.
+ * You can create such a `.osrm.*` dataset by running the OSRM binaries we ship in `node_modules/osrm/lib/binding/` and default
  * profiles (e.g. for setting speeds and determining road types to route on) in `node_modules/osrm/profiles/`:
  *
  *     node_modules/osrm/lib/binding/osrm-extract data.osm.pbf -p node_modules/osrm/profiles/car.lua
@@ -64,7 +64,7 @@ NAN_MODULE_INIT(Engine::Init)
  *
  * Consult the [osrm-backend](https://github.com/Project-OSRM/osrm-backend) documentation for further details.
  *
- * Once you have a complete `network.osrm` file, you can calculate routes in javascript with this object.
+ * Once you have a complete `network.osrm.*` dataset, you can calculate routes in javascript with this object.
  *
  * ```javascript
  * var osrm = new OSRM('network.osrm');