diff --git a/docs/run-instance/configuration/ors/engine/index.md b/docs/run-instance/configuration/ors/engine/index.md
index d39b41d48c..c9c162c7c5 100644
--- a/docs/run-instance/configuration/ors/engine/index.md
+++ b/docs/run-instance/configuration/ors/engine/index.md
@@ -3,12 +3,13 @@
 
 Engine properties are required at graph-build time during startup.
 
-| key              | type    | description                                                                                                                               | default value                              |
-|------------------|---------|-------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------|
-| init_threads     | number  | The number of threads used to initialize (build/load) graphs. Higher numbers requires more RAM                                            | `1`                                        |
-| preparation_mode | boolean | If set, graphs and preparations will be build, but the application will shut down immediately afterwards without starting up any services | `false`                                    |
-| source_file      | string  | The OSM file to be used, supported formats are `.osm`, `.osm.gz`, `.osm.zip` and `.pbf`                                                   | `ors-api/src/test/files/heidelberg.osm.gz` |
-| graphs_root_path | string  | The root path to a directory for storing graphs                                                                                           | `./graphs`                                 |
-| elevation        | object  | See [elevation properties](elevation.md)                                                                                                  |                                            |
-| profile_default  | object  | Described in [profile properties](profiles.md)                                                                                            |                                            |
-| profiles         | object  | Described in [profile properties](profiles.md)                                                                                            |                                            |
+| key                | type    | description                                                                                                                                                                                                                                                                                          | default value                              |
+|--------------------|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------|
+| init_threads       | number  | The number of threads used to initialize (build/load) graphs. Higher numbers requires more RAM                                                                                                                                                                                                       | `1`                                        |
+| preparation_mode   | boolean | If set, graphs and preparations will be build, but the application will shut down immediately afterwards without starting up any services                                                                                                                                                            | `false`                                    |
+| source_file        | string  | The OSM file to be used, supported formats are `.osm`, `.osm.gz`, `.osm.zip` and `.pbf`                                                                                                                                                                                                              | `ors-api/src/test/files/heidelberg.osm.gz` |
+| graphs_root_path   | string  | The root path to a directory for storing graphs                                                                                                                                                                                                                                                      | `./graphs`                                 |
+| graphs_data_access | string  | Defines how a DataAccess object is created. <br> - `MMAP`: memory mapped storage <br> - `RAM_STORE`: in-memory storage with a safe/flush option.<br> Further info in the [source code](https://github.com/GIScience/graphhopper/blob/ors_4.0/core/src/main/java/com/graphhopper/storage/DAType.java) | `RAM_STORE`                                |
+| elevation          | object  | See [elevation properties](elevation.md)                                                                                                                                                                                                                                                             |                                            |
+| profile_default    | object  | Described in [profile properties](profiles.md)                                                                                                                                                                                                                                                       |                                            |
+| profiles           | object  | Described in [profile properties](profiles.md)                                                                                                                                                                                                                                                       |                                            |