diff --git a/pkgs/additional/linux-sane-pinephonepro/default.nix b/pkgs/additional/linux-sane-pinephonepro/default.nix
index 6311d0c75..aca066fc6 100644
--- a/pkgs/additional/linux-sane-pinephonepro/default.nix
+++ b/pkgs/additional/linux-sane-pinephonepro/default.nix
@@ -81,8 +81,10 @@ linux_latest.override {
         # this is required for boot
         SYSFB_SIMPLEFB = lib.mkForce no;
 
-        # TODO: at least one of these is actually required for boot.
+        # this is required for boot (but why??)
         IO_STRICT_DEVMEM = no;
+
+        # TODO: is this safe to drop?
         PRINTK_INDEX = lib.mkForce no;
 
         # this is required for boot (but why??)