Add entry for unittest documentation.
diff --git a/Doc/Makefile.deps b/Doc/Makefile.deps
index f2385f8..aa75a6f 100644
--- a/Doc/Makefile.deps
+++ b/Doc/Makefile.deps
@@ -57,6 +57,7 @@
 	lib/libinspect.tex \
 	lib/libdifflib.tex \
 	lib/libdoctest.tex \
+	lib/libunittest.tex \
 	lib/libtypes.tex \
 	lib/libtraceback.tex \
 	lib/libpickle.tex \