diff --git a/docs/TODO b/docs/TODO
index 9f78074a33..3b1b53d88a 100644
--- a/docs/TODO
+++ b/docs/TODO
@@ -36,6 +36,7 @@
  1.18 try next proxy if one doesn't work
  1.19 Timeout idle connections from the pool
  1.20 SRV and URI DNS records
+ 1.21 Have the URL API offer IDN decoding
  1.22 CURLINFO_PAUSE_STATE
  1.23 Offer API to flush the connection pool
  1.24 TCP Fast Open for windows
@@ -375,6 +376,12 @@
  Offer support for resolving SRV and URI DNS records for libcurl to know which
  server to connect to for various protocols (including HTTP!).
 
+1.21 Have the URL API offer IDN decoding
+
+ Similar to how URL decoding/encoding is done, we could have URL functions to
+ convert IDN host names to punycode (probably not the reverse).
+ https://github.com/curl/curl/issues/3232
+
 1.22 CURLINFO_PAUSE_STATE
 
  Return information about the transfer's current pause state, in both