Typo: "dead lock" --> "deadlock"
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index cf68f60..6674e88 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -344,7 +344,7 @@
\class{Popen3} and \class{Popen4} classes from the \refmodule{popen2}
module; these are only available on \UNIX.
-For a discussion of possible dead lock conditions related to the use
+For a discussion of possible deadlock conditions related to the use
of these functions, see ``\ulink{Flow Control
Issues}{popen2-flow-control.html}''
(section~\ref{popen2-flow-control}).