diff --git a/openssl/src/x509/mod.rs b/openssl/src/x509/mod.rs
index e5f2777f..775aac69 100644
--- a/openssl/src/x509/mod.rs
+++ b/openssl/src/x509/mod.rs
@@ -399,6 +399,8 @@ impl X509Ref {
     }
 
     /// Returns the hash of the certificates subject
+    ///
+    /// This corresponds to `X509_subject_name_hash`.
     pub fn subject_name_hash(&self) -> u32 {
         unsafe { ffi::X509_subject_name_hash(self.as_ptr()) as u32 }
     }