diff --git a/README.md b/README.md
index 73d3ed8..69461a2 100644
--- a/README.md
+++ b/README.md
@@ -21,11 +21,14 @@ Docker Swarm has secret support built-in, for Docker Standalone/Podman you will
 
 See the table below for the environment variable name, the configuration file path.  Some values have defaults which will be used if the variable is not set and the file path does not exist.  In cases where the file path exists and the environment variable also exists, the environment variable will be used.  All values without a default are required,timetable-mgr will exit if it cannot load a value.
 
-| Variable Name | File Path           | Default Value |
-| :------------ | :------------------ | :------------ |
-| OWL_NROD_USER | /owl/conf/nrod/user |               |
-| OWL_NROD_PASS | /owl/conf/nrod/pass |               |
-| OWL_DB_HOST   | /owl/conf/db/host   | localhost     |
-| OWL_DB_PORT   | /owl/conf/db/port   | 27017         |
-| OWL_DB_USER   | /owl/conf/db/user   |               |
-| OWL_DB_PASS   | /owl/conf/db/pass   |               |
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+| Variable Name | File Path           | Default Value | Description |
+| :------------ | :------------------ | :------------ | :---------- |
+| OWL_VSTP_ON   | /owl/conf/vstp/on   | on            | Enable/Disable VSTP Updates ^1^ |
+| OWL_NROD_USER | /owl/conf/nrod/user |               | Network Rail NROD Username |
+| OWL_NROD_PASS | /owl/conf/nrod/pass |               | Network Rail NROD Password |
+| OWL_DB_HOST   | /owl/conf/db/host   | localhost     | MongoDB Host |
+| OWL_DB_PORT   | /owl/conf/db/port   | 27017         | MongoDB Port |
+| OWL_DB_USER   | /owl/conf/db/user   |               | MongoDB Username |
+| OWL_DB_PASS   | /owl/conf/db/pass   |               | MondoDB Password |
+
+^1^ Set to 'off' to disable VSTP Updates.  Useful in testing as you cannot have two clients connected.
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