Added entry for pty module.
diff --git a/Doc/Makefile.deps b/Doc/Makefile.deps
index 3870713..e968cd7 100644
--- a/Doc/Makefile.deps
+++ b/Doc/Makefile.deps
@@ -198,6 +198,7 @@
 	../lib/libmutex.tex \
 	../lib/libnis.tex \
 	../lib/libpipes.tex \
+	../lib/libpty.tex \
 	../lib/librlcompleter.tex \
 	../lib/libsched.tex \
 	../lib/libstatvfs.tex \