diff --git a/src/float.rs b/src/float.rs
index 4274fe7..548a207 100644
--- a/src/float.rs
+++ b/src/float.rs
@@ -1917,7 +1917,7 @@ pub trait CommonFloat where Self: Num + Copy + NumCast + Neg<Output = Self> {
     /// 
     /// let difference = a.pown(b);
     /// 
-    /// assert(difference > 3.9f64);
+    /// assert!(difference > 3.9f64);
     /// ```
     fn pown(self, n: Self) -> Self;