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}).
diff --git a/Doc/lib/libpopen2.tex b/Doc/lib/libpopen2.tex
index 83b85ab..41a7e8e 100644
--- a/Doc/lib/libpopen2.tex
+++ b/Doc/lib/libpopen2.tex
@@ -129,7 +129,7 @@
 
 When reading output from a child process that writes a lot of data to
 standard error while the parent is reading from the child's standard
-out, a dead lock can occur.  A similar situation can occur with other
+out, a deadlock can occur.  A similar situation can occur with other
 combinations of reads and writes.  The essential factors are that more
 than \constant{_PC_PIPE_BUF} bytes are being written by one process in
 a blocking fashion, while the other process is reading from the other