diff --git a/README.md b/README.md
index 27b3634..47a8788 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,9 @@ cargo install --locked --git https://firefish.dev/firefish/fishctl.git
 Using the `registry.firefish.dev/firefish/fishctl` container image, `fishctl ___` commands can be executed as
 
 ```sh
+# Assuming that $(pwd) (current directory) is the parent of the config directory
+# (i.e., the Firefish local repository directory)
+
 docker run -it --rm --volume "$(pwd)":/firefish --network network_name \
   registry.firefish.dev/firefish/fishctl \
   fishctl ___
@@ -53,7 +56,7 @@ podman run -it --rm --volume "$(pwd)":/firefish --network network_name \
 
 Where `network_name` is the network name on which the database is running. If you want to use this for the host network (i.e., use the container as if it were a locally installed command), you should replace `network_name` with `host`.
 
-If you are using a container network (which is typically the case if you are using `docker-compose.yml` to run Firefish), you need to search for your network name by `docker network ls` or `podman network ls`:
+If you are using a container network (which is typically the case if you are using `compose.yml` or `docker-compose.yml` to run Firefish), you need to search for your network name by `docker network ls` or `podman network ls`:
 
 ```
 $ podman network ls  # the network name is `firefish_calcnet` in this case
@@ -64,7 +67,9 @@ NETWORK ID    NAME                      DRIVER
 
 ## Usage
 
-Please make sure to `cd` to the Firefish local repository before running these commands.
+Please make sure to `cd` to the Firefish local repository (more precisely, the parent directory of the config directory) before running these commands, or specify that directory using `--base-dir` option.
+
+If you use a custom Firefish setup and let's say your config files are located at `/etc/firefish/config`, you should provide `--base-dir /etc/firefish` option or `cd` to `/etc/firefish` directory.
 
 ### Update the config files
 
@@ -88,9 +93,9 @@ Execute the following command to validate the config files.
 fishctl config validate
 ```
 
-Note that some items are only formally checked, so even if the output says it is valid, your settings may not be appropriate.
+Please note that some items are only formally checked. Even if the output says it is valid, your settings can be incorrect.
 
-This command performs a connection check against the PostgreSQL server and the Redis/Valkey server. You can bypass this check using the `--offline` option:
+This command performs a connection check against the PostgreSQL server and the cache server (Valkey/Redis). You can bypass this check using the `--offline` option:
 
 ```sh
 fishctl config validate --offline