diff --git a/scrapy/core/downloader/tls.py b/scrapy/core/downloader/tls.py
index c97c6a9a9..df8051182 100644
--- a/scrapy/core/downloader/tls.py
+++ b/scrapy/core/downloader/tls.py
@@ -63,8 +63,9 @@ if twisted_version >= (14, 0, 0):
         (for genuinely invalid certificates or bugs in verification code).
 
         Same as Twisted's private _sslverify.ClientTLSOptions,
-        except that VerificationError and ValueError exceptions are caught,
-        so that the connection is not closed, only logging warnings.
+        except that VerificationError, CertificateError and ValueError
+        exceptions are caught, so that the connection is not closed, only
+        logging warnings.
         """
 
         def _identityVerifyingInfoCallback(self, connection, where, ret):