diff --git a/src/main.rs b/src/main.rs
index b08909c..3a3c50a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -10,9 +10,16 @@ pub struct ThreadPool{
 }
 
 impl ThreadPool {
+    /// Create a new ThreadPool
+    ///
+    /// # Panics
+    ///
+    /// The `new` function panics if the size is zero
     pub fn new(size: usize) -> ThreadPool {
+        assert!(size > 0);
         Self{}
     }
+    
 }
 
 fn main() -> std::io::Result<()> {