Update README.md

README.md

@@ -48,7 +48,7 @@ Add or overwrite Observium settings in the `observium/.env` file using the `OBSE
 
 - Using a single underscore (`_`) will include an underscore in the key (e.g., `OBSERVIUM__enable_bgp=0`).
 - Using a double underscore (`__`) will add the value to an associative array with the given key.
-- Using a double underscore with a number (`__0`) will add the value to an indexed/sequential array.
+- Using a double underscore with a number (`__0`) will add the value to an indexed/sequential array at the indicated index.
 - Dashes cannot be used in environment variables. To represent a dash in the key, escape it using triple underscores (`___`).
 
 Refer to the example below: