diff --git a/todo.md b/todo.md
index bdc4ad7..dbfab19 100644
--- a/todo.md
+++ b/todo.md
@@ -1,25 +1,28 @@
-## TODO
+# TODO
 
+- fix freq2/mem clock on internal GPUs; report unknown
+- add an interval mode; log stats to logging widget occasionally
+- binding/method to save log to text file
 - add vram stats: used / total
 - add unit toggle/binding; `Ghz` can be fairly vague - users may prefer `Mhz`/`Hz`
-    - tldr: may be wanted for precision
-    - driver provides *hertz*, with modern cards is fairly excessive
-    - conversion is done using `format_frequency`
-        - a wrapper of `format_size` from `humanfriendly`
-        - _(currently)_ defaults to highest sensible unit, changing on scale. 
-        - often flipping between `500Mhz` / `2.6Ghz` where consistency may be preferred
+  - tldr: may be wanted for precision
+  - driver provides *hertz*, with modern cards is fairly excessive
+  - conversion is done using `format_frequency`
+    - a wrapper of `format_size` from `humanfriendly`
+    - *(currently)* defaults to highest sensible unit, changing on scale.
+    - often flipping between `500Mhz` / `2.6Ghz` where consistency may be preferred
 - address assumptions on some statistic files
-    - Clocks:
-        - core/memory assumed provided by `freq1_input` and `freq2_input` respectively
-        - nearby files named `freq*_label` can determine this reliably
-    - Voltage:
-        - similarly, `in0_input` is the assumed voltage file
-        - indicated by `in*_label` with `vddgfx` inside
-        - no accounting for other voltage files currently; `APUs` / other cards may show more
+  - Clocks:
+    - core/memory assumed provided by `freq1_input` and `freq2_input` respectively
+    - nearby files named `freq*_label` can determine this reliably
+  - Voltage:
+    - similarly, `in0_input` is the assumed voltage file
+    - indicated by `in*_label` with `vddgfx` inside
+    - no accounting for other voltage files currently; `APUs`/other cards may differ
 - `argparse` extensions
-    - restore `--card` / `-c` under `argparse`
-        - to skip `amdgpu` device detection
-        - will expect `cardN` or `renderANNN` from `/dev/dri/` 
-        - provides the (AMD) GPU intended to be monitored
-        - may require card/hwmon detection be separate tasks
-    - preferred unit for clocks
+  - restore `--card` / `-c` under `argparse`
+    - to skip `amdgpu` device detection
+    - will expect `cardN` or `renderANNN` from `/dev/dri/`
+    - provides the (AMD) GPU intended to be monitored
+    - may require card/hwmon detection be separate tasks
+  - preferred unit for clocks