diff --git a/docs/libcurl/symbols-in-versions b/docs/libcurl/symbols-in-versions
index 9257fb16b9..a91f4fb00f 100644
--- a/docs/libcurl/symbols-in-versions
+++ b/docs/libcurl/symbols-in-versions
@@ -20,6 +20,7 @@ CURLAUTH_DIGEST_IE              7.19.3
 CURLAUTH_GSSNEGOTIATE           7.10.6
 CURLAUTH_NONE                   7.10.6
 CURLAUTH_NTLM                   7.10.6
+CURLAUTH_NTLM_SSO               7.21.8
 CURLAUTH_ONLY                   7.21.3
 CURLCLOSEPOLICY_CALLBACK        7.7
 CURLCLOSEPOLICY_LEAST_RECENTLY_USED 7.7
@@ -675,6 +676,7 @@ CURL_VERSION_KERBEROS4          7.10
 CURL_VERSION_LARGEFILE          7.11.1
 CURL_VERSION_LIBZ               7.10
 CURL_VERSION_NTLM               7.10.6
+CURL_VERSION_NTLM_SSO           7.21.8
 CURL_VERSION_SPNEGO             7.10.8
 CURL_VERSION_SSL                7.10
 CURL_VERSION_SSPI               7.13.2