diff --git a/doc/research.md b/doc/research.md
index 5fc5625..3be9262 100644
--- a/doc/research.md
+++ b/doc/research.md
@@ -104,6 +104,7 @@ Relations between mechanics:
 - [ ] Pressure decelerates you
     - relative to the motion of the planet plus the wind
     - scaled by your surface area
+- [ ] Ambient temperature heats up suit/vehicle temperature, depending on density
 - [ ] [Buoyancy](https://en.wikipedia.org/wiki/Buoyancy): upward acceleration depending on densities (yours and ambient), altitude (gravitational acceleration), and your mass
     - Negligible for any current vehicles but could be cool for zeppelins
 - [ ] [Drag?](https://en.wikipedia.org/wiki/Drag_(physics)) (with different drag coefficients depending on vehicle and angle)