minor markup nits; fix missing whitespace
diff --git a/Doc/ref/ref2.tex b/Doc/ref/ref2.tex
index 6e96ffe..b8ddacb 100644
--- a/Doc/ref/ref2.tex
+++ b/Doc/ref/ref2.tex
@@ -397,8 +397,8 @@
One syntactic restriction not indicated by these productions is that
whitespace is not allowed between the \grammartoken{stringprefix} and
the rest of the string literal. The source character set is defined
-by the encoding declaration; it is \ASCII if no encoding declaration
-is given in the source file; see \ref{encodings}.
+by the encoding declaration; it is \ASCII{} if no encoding declaration
+is given in the source file; see section~\ref{encodings}.
\index{triple-quoted string}
\index{Unicode Consortium}