diff --git a/Doc/Makefile.deps b/Doc/Makefile.deps
index fc052f4..3f569ef 100644
--- a/Doc/Makefile.deps
+++ b/Doc/Makefile.deps
@@ -284,6 +284,7 @@
 	lib/libcalendar.tex \
 	lib/libpopen2.tex \
 	lib/libbisect.tex \
+	lib/libcollections.tex \
 	lib/libheapq.tex \
 	lib/libmimetypes.tex \
 	lib/libsmtplib.tex \