diff --git a/.test_fixtures/mesecons.lua b/.test_fixtures/mesecons.lua
index f10d59e..d8695ba 100644
--- a/.test_fixtures/mesecons.lua
+++ b/.test_fixtures/mesecons.lua
@@ -144,6 +144,7 @@ function mesecon._test_place(pos, node)
 end
 
 function mesecon._test_reset()
+	-- First let circuits settle by simulating many globalsteps.
 	for i = 1, 30 do
 		mineunit:execute_globalstep(60)
 	end