diff --git a/systems.tex b/systems.tex
index e02afa9870f72b3b15e3a6d606af68bef86160ce..f7563652f7216fce3fbb16d1164743002945d68b 100644
--- a/systems.tex
+++ b/systems.tex
@@ -14,10 +14,10 @@
 A tie could indicate that the door has a massive hole in the middle, allowing a sufficiently small person to squeeze through; or it might indicate that the door caves in after multiple, noisy strikes.
 
 \makeRule{excavation}{Excavation}{Strength}{Caving}{depends on the type of rock}
+\index{Spelunking!Excavation}
 
 \subsection{Downtime Activities}
 
-
 \makeRule{poison}{Brewing a poison}{Intelligence}{Medicine}{4}
 \index{Poisons}