diff --git a/src/validate.rs b/src/validate.rs
index 3293df0f..37d44836 100644
--- a/src/validate.rs
+++ b/src/validate.rs
@@ -1712,6 +1712,19 @@ pub enum Nsec3HashError {
     CollisionDetected,
 }
 
+///--- Display
+
+impl std::fmt::Display for Nsec3HashError {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        match self {
+            Nsec3HashError::UnsupportedAlgorithm => f.write_str("Unsupported algorithm"),
+            Nsec3HashError::AppendError => f.write_str("Append error: out of memory?"),
+            Nsec3HashError::OwnerHashError => f.write_str("Hashing produced an invalid owner hash"),
+            Nsec3HashError::CollisionDetected => f.write_str("Hash collision detected"),
+        }
+    }
+}
+
 /// Compute an [RFC 5155] NSEC3 hash using default settings.
 ///
 /// See: [Nsec3param::default].