diff --git a/docs/TODO b/docs/TODO
index 8c69e3fbd..d6240d4d5 100644
--- a/docs/TODO
+++ b/docs/TODO
@@ -165,6 +165,7 @@
  19. Build
  19.1 roffit
  19.2 Enable PIE and RELRO by default
+ 19.3 cmake test suite improvements
 
  20. Test suite
  20.1 SSL tunnel
@@ -1152,6 +1153,13 @@ that doesn't exist on the server, just like --ftp-create-dirs.
  to no impact, neither on the performance nor on the general functionality of
  curl.
 
+19.3 cmake test suite improvements
+
+ The cmake build doesn't support 'make show' so it doesn't know which tests
+ are in the makefile or not (making appveyor builds do many false warnings
+ about it) nor does it support running the test suite if building out-of-tree.
+
+ See https://github.com/curl/curl/issues/3109
 
 20. Test suite