add more info about configuring event-handler

README.md

@@ -15,7 +15,20 @@ going to sleep. The inhibitor is removed when the system is unplugged.
 > monitor battery events ensure you have it installed and running before using
 > event-handler
 
-## Default Config
+## Configuring
+I built event-handler to be used as a service independent of my current user
+and such event-handler does not read the configuration file from any default
+path. Instead it's up to you to choose where it is and pass the file's full
+path into event-handler like so:
+```bash
+eh -c ./config.toml
+```
+
+The config is completely optional, however you will most likely need it as the
+default is setup for my framework 13 system running Void Linux. Below are the
+defaults:
+
+### Default Config
 ```toml
 [battery]
 status_path = "/sys/class/power_supply/BAT1"
@@ -31,3 +44,8 @@ timing_formula = "1.7 + 18.5 * exp(-0.29 * p)" # p is the percentage of the batt
 [acpi_daemon]
 socket_path = "/run/acpid.socket"
 ```
+
+> [!NOTE]
+> The default formula may or may not work above 15 percent due to led
+> shenanigans. If you wish to craft your own formula all relevant notation may
+> be found in [this repo](https://github.com/codeplea/tinyexpr).