X-Git-Url: https://git.arvados.org/arvados-workbench2.git/blobdiff_plain/f05e6a9cece7e3b118134136ee81bd7477ad10a0..c055c90f752c104305e4097a9b7b5d029615e08f:/README.md

diff --git a/README.md b/README.md
index 864a54fa..e2e14ce4 100644
--- a/README.md
+++ b/README.md
@@ -26,14 +26,47 @@ yarn install
 yarn build
 </pre>
 
-### Configuration
+### Build time configuration
 You can customize project global variables using env variables. Default values are placed in the `.env` file.
 
 Example:
 ```
-REACT_APP_ARVADOS_API_HOST=localhost:8000 yarn start
+REACT_APP_ARVADOS_CONFIG_URL=config.json yarn build
 ```
 
+### Run time configuration
+The app will fetch runtime configuration when starting. By default it will try to fetch `/config.json`. You can customize this url using build time configuration.
+
+Currently this configuration schema is supported:
+```
+{
+    "API_HOST": "string",
+    "VOCABULARY_URL": "string",
+    "FILE_VIEWERS_CONFIG_URL": "string",
+}
+```
+
+#### API_HOST
+
+The Arvados base URL. 
+
+The `REACT_APP_ARVADOS_API_HOST` environment variable can be used to set the default URL if the run time configuration is unreachable.
+
+#### VOCABULARY_URL
+Local path, or any URL that allows cross-origin requests. See 
+[Vocabulary JSON file example](public/vocabulary-example.json).
+
+To use the URL defined in the Arvados cluster configuration, remove the entire `VOCABULARY_URL` entry from the runtime configuration. Found in `/config.json` by default.
+
+### FILE_VIEWERS_CONFIG_URL
+Local path, or any URL that allows cross-origin requests. See:
+
+[File viewers config file example](public/file-viewers-example.json)
+
+[File viewers config scheme](src/models/file-viewers-config.ts)
+
+To use the URL defined in the Arvados cluster configuration, remove the entire `FILE_VIEWERS_CONFIG_URL` entry from the runtime configuration. Found in `/config.json` by default.
+
 ### Licensing
 
 Arvados is Free Software. See COPYING for information about Arvados Free