diff --git a/sort_certificate.py b/sort_certificate.py
index d147c8a..db26b60 100755
--- a/sort_certificate.py
+++ b/sort_certificate.py
@@ -55,7 +55,9 @@ class PkDecoratorRSA(PkDecorator):
 
     def __str__(self):
         pk_crypto = self.pk.to_cryptography_key()
-        return "RSA Private key %d bits" % pk_crypto.key_size
+        return "RSA Private key %d bits (exponent %d)" % (
+                pk_crypto.key_size,
+                pk_crypto.private_numbers().public_numbers.e)
 
 
 class PkDecoratorDSA(PkDecorator):