diff --git a/config.toml b/config.toml
index a2b3211..b7dda96 100644
--- a/config.toml
+++ b/config.toml
@@ -1,9 +1,9 @@
 secret = "your login secret"
+prefix = ">"
 
 [[command]]
-# The prefix (a constant in the source code)
-# does not need to be specified here.
-# It is added automatically.
+# The prefix does not need to be added here.
+# That is done automatically.
 trigger = "create_file"
 # Spaces are not escaped here
 command = "touch /tmp/test-rce"
diff --git a/src/commands.rs b/src/commands.rs
index 030e6aa..aa736a3 100644
--- a/src/commands.rs
+++ b/src/commands.rs
@@ -1,9 +1,9 @@
-use super::config::CONFIG;
+use super::config::*;
 use cmd_lib::{CmdResult, Process};
 use serde::Deserialize;
 use serenity::model::channel::Message;
 
-#[derive(Deserialize, Debug)]
+#[derive(Deserialize, Debug, PartialEq, Clone)]
 pub struct Command {
     trigger: String,
     command: String,
@@ -14,8 +14,10 @@ pub fn print_commands() {
     CONFIG.commands.iter().for_each(|c| println!("{:?}", c));
 }
 
-pub fn find_matching(message: &str) -> Option<&Command> {
-    CONFIG.commands.iter().find(|&c| message[1..] == c.trigger)
+pub fn find_matching<'a>(message: &str, cfg: &'a Config) -> Option<&'a Command> {
+    cfg.commands
+        .iter()
+        .find(|&c| message[cfg.prefix.len()..] == c.trigger)
 }
 
 impl Command {
@@ -33,4 +35,12 @@ impl Command {
             .wait::<CmdResult>()
             .map_err(|e| format!("{:?}", e))
     }
+
+    pub fn new(command: &str, trigger: &str, users: Vec<u64>) -> Self {
+        Self {
+            command: String::from(command),
+            trigger: String::from(trigger),
+            users,
+        }
+    }
 }
diff --git a/src/config.rs b/src/config.rs
index e434881..2ad6985 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -11,6 +11,7 @@ pub struct Config {
     #[serde(rename = "command")]
     pub commands: Vec<Command>,
     pub secret: String,
+    pub prefix: String,
 }
 
 lazy_static! {
diff --git a/src/main.rs b/src/main.rs
index 42b4bcd..057412a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 #[macro_use]
 extern crate lazy_static;
 use commands::*;
+use config::CONFIG;
 use serenity::model::channel::Message;
 use serenity::model::id::ChannelId;
 use serenity::prelude::*;
@@ -15,18 +16,16 @@ pub fn main() {
         .expect("Could not connect to discord");
 }
 
-const PREFIX: char = '>';
-
 pub struct Handler;
 impl EventHandler for Handler {
     fn message(&self, ctx: Context, msg: Message) {
-        if !msg.content.starts_with(PREFIX) {
+        if !msg.content.starts_with(&CONFIG.prefix) {
             return;
         }
-        if let Some(command) = find_matching(&msg.content) {
+        if let Some(command) = find_matching(&msg.content, &CONFIG) {
             let response = match command.execute(&msg) {
                 Err(e) => e,
-                Ok(()) => "Done".to_owned(),
+                Ok(()) => String::from("Done."),
             };
             send(msg.channel_id, &response, &ctx);
         }
@@ -38,3 +37,29 @@ pub fn send(target: ChannelId, message: &str, ctx: &Context) {
         println!("Could not send message: {}", cause);
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::commands::*;
+    use super::config::*;
+    use super::*;
+
+    #[test]
+    fn find_matching_test() {
+        let cmd = Command::new("ls -l", "show_files", vec![1234567890]);
+        let cfg = Config {
+            prefix: String::from(">"),
+            secret: String::from("1qay2wsx3edc45fv"),
+            commands: vec![cmd.clone()],
+        };
+        assert_eq!(find_matching(&">show_files", &cfg), Some(&cmd));
+        assert_eq!(find_matching(&">show something else", &cfg), None);
+
+        let cfg = Config {
+            prefix: String::from("!!"),
+            ..cfg
+        };
+        assert_eq!(find_matching(&">show_files", &cfg), None);
+        assert_eq!(find_matching(&"!!show_files", &cfg), Some(&cmd));
+    }
+}