mention the use of `config.expand-env` flag in the doc. (#3078)

5 years ago · 3edcda744e
parent ee9c629f51
commit 3edcda744e
1 changed files with 2 additions and 0 deletions
--- a/docs/sources/configuration/_index.md
+++ b/docs/sources/configuration/_index.md
@ -89,6 +89,8 @@ ${VAR:default_value}

 Where default_value is the value to use if the environment variable is undefined.

+Pass the `-config.expand-env` flag at the command line to enable this way of setting configs.
+
 ### Generic placeholders:

 - `<boolean>` : a boolean that can take the values `true` or `false`