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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -75,6 +75,7 @@ It is good idea to obtain Telegram API ID from [**https://my.telegram.org**](htt
 * `--profiling-port=xxxx`: start the pprof server on port `xxxx`. Access is limited to localhost.
 * `--config=/bla/bla/config.yml`: set the config file path (default: `config.yml`).
 * `--schema=/bla/bla/schema.json`: set the schema file path (default: `./config_schema.json`).
+* `--ids=/bla/bla/ids`: set the folder for ids database (default: `ids`).
 
 ### How to receive files from Telegram ###