diff --git a/traits.tex b/traits.tex
index df1c851c61ff470fc3322fed6ee22814774a7a7a..5c3b93d8d54e82f85f2ee54abb4a0210c6636db3 100644
--- a/traits.tex
+++ b/traits.tex
@@ -614,6 +614,7 @@ Those with performance will pick up at least one instrument per level.
 \end{exampletext}
 
 \subsection{Seafaring}
+\index{Sailing}
 
 Sailors don't just sail, they typically know how to fish, coordinate reefs, work with others on larger boats, mend masts, sails and nets, and generally do a lot of sewing.