diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index b4e7960..f990e8c 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -1143,7 +1143,8 @@
 
         handshake->calc_verify( ssl, session_hash, &hash_len );
 
-        MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len );
+        MBEDTLS_SSL_DEBUG_BUF( 3, "session hash for extended master secret",
+                                  session_hash, hash_len );
 
         ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
                                   "extended master secret",