diff --git a/README.md b/README.md
index 8a5fb4a8..10e668b2 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,7 @@ Updates include:
 - FPS dependant fire rates and player physics.  These have significantly improved with the Half-Life update and are also a non-issue now that other FPS dependency fixes are in the game and the game can be played at high frame rates, where fire rates don't vary. Very high framerates cause collision issues and other engine limitations, so an fps of 200 or 250 is recommended unless fixed.
 - Flashing available alien upgrade icons (defense, movement and sensory) tend to disappear when a player dies and respawns. The icons won't appear until the alien chooses an upgrade.
 - func_train and func_tracktrain entities don't reset to their original positions when a round has ended
+- If parts of map have negative Z coordinates, clicking a structure can deselect it or select antoher structure. Make sure all parts of the map have positive Z coordinate.
 
 If you find more please report them!