diff --git a/docs/TODO b/docs/TODO
index 8f4d63322fed32..03586bb0915fb3 100644
--- a/docs/TODO
+++ b/docs/TODO
@@ -41,6 +41,7 @@
  5.3 Rearrange request header order
  5.4 SPDY
  5.5 auth= in URLs
+ 5.6 Digest via Windows SSPI
 
  6. TELNET
  6.1 ditch stdin
@@ -303,6 +304,12 @@ support for Kerberos via Windows SSPI.
 
  Additionally this should be implemented for proxy base URLs as well.
 
+5.6 Digest via Windows SSPI
+
+ libcurl already supports HTTP Digest Authentication via native routines as well
+ as SASL Digest via both Windows SSPI and native routines. In addition to this
+ libcurl should also support HTTP Digest Authentication via Windows SSPI.
+
 6. TELNET
 
 6.1 ditch stdin