diff --git a/src/config.rs b/src/config.rs
index 9984578..d966857 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -99,9 +99,10 @@ impl Config {
     }
 
     /// List the end of life rules set in the configuration
-    pub fn list_rules(&self) {
+    pub fn list_rules(&self) -> Result<(), Error> {
         for rule in &self.rules {
             println!("{rule}");
         }
+        Ok(())
     }
 }