diff --git a/library/error.c b/library/error.c
index 3854ab5..9d758df 100644
--- a/library/error.c
+++ b/library/error.c
@@ -221,7 +221,7 @@
         if( use_ret == -(MBEDTLS_ERR_ECP_INVALID_KEY) )
             mbedtls_snprintf( buf, buflen, "ECP - Invalid private or public key" );
         if( use_ret == -(MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH) )
-            mbedtls_snprintf( buf, buflen, "ECP - Signature is valid but shorter than the user-supplied length" );
+            mbedtls_snprintf( buf, buflen, "ECP - The buffer contains a valid signature followed by more data" );
 #endif /* MBEDTLS_ECP_C */
 
 #if defined(MBEDTLS_MD_C)
@@ -284,7 +284,7 @@
         if( use_ret == -(MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE) )
             mbedtls_snprintf( buf, buflen, "PK - Unavailable feature, e.g. RSA disabled for RSA key" );
         if( use_ret == -(MBEDTLS_ERR_PK_SIG_LEN_MISMATCH) )
-            mbedtls_snprintf( buf, buflen, "PK - The signature is valid but its length is less than expected" );
+            mbedtls_snprintf( buf, buflen, "PK - The buffer contains a valid signature followed by more data" );
 #endif /* MBEDTLS_PK_C */
 
 #if defined(MBEDTLS_PKCS12_C)