diff --git a/src/ipv6.rs b/src/ipv6.rs
index 64d90c8..ea35cc3 100644
--- a/src/ipv6.rs
+++ b/src/ipv6.rs
@@ -90,7 +90,7 @@ impl Ipv6Network {
     ///
     /// # Safety
     ///
-    /// The caller must ensure that the prefix is less than or equal to 32.
+    /// The caller must ensure that the prefix is less than or equal to 128.
     ///
     /// # Examples
     ///