fix underscores

diff --git a/docs/manual/critical.tex b/docs/manual/critical.tex
index 1bbef3ffd41ddba144b6dbbcacab8b57290fef81..14dddf47a0d5440648cd8ccd3a03e6d2c25fccdc 100644 (file)
--- a/docs/manual/critical.tex
+++ b/docs/manual/critical.tex
@@ -83,7 +83,7 @@ production, use the checklist anyway).
    automatically convert from Unicode to UTF-8, but on Unix, Linux, *BSD,
    and MacOS X machines, you must explicitly ensure that your locale is set
    properly. Typically this means that the {bf LANG} environment variable
-   must end in {\bf .UTF-8}. An full example is {\bf en_US.UTF-8}. The
+   must end in {\bf .UTF-8}. An full example is {\bf en\_US.UTF-8}. The
    exact syntax may vary a bit from OS to OS, and exactly how you define it
    will also vary.
 \end{itemize}