diff --git a/Doc/Makefile.deps b/Doc/Makefile.deps
index 38707132080..e968cd73376 100644
--- a/Doc/Makefile.deps
+++ b/Doc/Makefile.deps
@@ -198,6 +198,7 @@ LIBFILES= ../lib/lib.tex \
 	../lib/libmutex.tex \
 	../lib/libnis.tex \
 	../lib/libpipes.tex \
+	../lib/libpty.tex \
 	../lib/librlcompleter.tex \
 	../lib/libsched.tex \
 	../lib/libstatvfs.tex \
diff --git a/Doc/lib/lib.tex b/Doc/lib/lib.tex
index 15535acb7a3..69bc73075a6 100644
--- a/Doc/lib/lib.tex
+++ b/Doc/lib/lib.tex
@@ -172,6 +172,7 @@ add new extensions to Python and how to embed it in other applications.
 \input{libgdbm}
 \input{libtermios}
 \input{libtty}
+\input{libpty}
 \input{libfcntl}
 \input{libpipes}
 \input{libposixfile}