diff --git a/runoff.spec b/runoff.spec
index c9ca4c1..8f800ac 100644
--- a/runoff.spec
+++ b/runoff.spec
@@ -1,3 +1,4 @@
+# Is sheet 01 (after the TOC) a left sheet or a right sheet?
 sheet1: right
 
 # "left" and "right" specify which page of a two-page spread a file