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@@ -65,6 +65,13 @@ $ birka-cli query
 ...
 ```
 
+The tag database is stored in a file, and the path of that file is dependent on
+how the program is invoked. If, when parsing the command-line arguments,
+`birka-cli` sees a `-o` or `--output` argument, the path following that argument
+will be used. Alternatively, the `TB_PATH` environment variable can be
+specified, but `-o` takes a higher precedence. If neither are specified,
+"birka.db" in the current directory is used.
+
 ### Web-Interface (API)
 
 The web interface for бирка-тян exposes a RESTful API for remotely interacting