diff --git a/src/hasher.rs b/src/hasher.rs
index d34a11d1..40984f1a 100644
--- a/src/hasher.rs
+++ b/src/hasher.rs
@@ -19,7 +19,7 @@
 //!     pool: None,
 //!     restat: false,
 //! };
-//! let hash = ActionHasher::hash(&action);
+//! let hash = ActionHasher::hash(&action).expect("failed to hash action");
 //! assert!(!hash.is_empty());
 //! ```