diff --git a/src/cpu.rs b/src/cpu.rs
index 2e0db57..736008a 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -120,6 +120,8 @@ impl Cpu {
     }
 
     fn rescan_times(&mut self) -> anyhow::Result<()> {
+        // TODO: Don't read this per CPU. Share the read or
+        // find something in /sys/.../cpu{N} that does it.
         let content = fs::read("/proc/stat")
             .context("/proc/stat does not exist")?
             .context("failed to read CPU stat")?;