Fixed Tuples heading

diff --git a/doc/manual.tex b/doc/manual.tex
index 034e772..beb35d5 100644 (file)
--- a/doc/manual.tex
+++ b/doc/manual.tex
@@ -84,7 +84,7 @@ In addition to SML's $\sim$ prefix negation operator, there is a \$ operator for
 
 Function application is like SML application.
 
-\subsection{Tuples}
+\subsubsection{Tuples}
 
 Tuple and {\tt ()} expressions are handled identically to how they are in SML.