diff --git a/TODO.md b/TODO.md
index c14775d..82274da 100644
--- a/TODO.md
+++ b/TODO.md
@@ -7,7 +7,7 @@ If you are working on a task, please put your github @name next to it
   * ~~use help text to indicate underlying WMI metrics, rather than human-readable text~~
   * ~~perf: hardcode the "_Total" disk and always exclude it~~
   * perf: FreeMegabytes should be a ratio
-  * perf: dont export Avg* and *_Base values
+  * perf: dont export Avg* and *_Base values (https://github.com/martinlindhe/wmi_exporter/issues/4)
 
 ## Roadmap
   * stabilize naming