diff --git a/gap.tex b/gap.tex
index 9087c58..d9526a7 100644
--- a/gap.tex
+++ b/gap.tex
@@ -200,8 +200,8 @@ \subsection{Sources}
 \end{itemize}
 
 \subsection{Changes from previous edition}
-Changes from the 2015 edition of this document will be marked with a vertical
-sidebar.
+Changes from the previous edition of this document are underlined (a few words)
+or marked with a vertical sidebar (whole paragraph).
 
 \subsection{Differences between Hang-Gliding and Paragliding}
 Initially, both hang-gliding and paragliding competitions used the same system