diff --git a/Makefile b/Makefile
index ea7454632d..39d39257e0 100644
--- a/Makefile
+++ b/Makefile
@@ -744,6 +744,8 @@ TEST_BUILTINS_OBJS += test-urlmatch-normalization.o
 TEST_BUILTINS_OBJS += test-wildmatch.o
 TEST_BUILTINS_OBJS += test-write-cache.o
 
+# Do not add more tests here unless they have extra dependencies. Add
+# them in TEST_BUILTINS_OBJS above.
 TEST_PROGRAMS_NEED_X += test-fake-ssh
 TEST_PROGRAMS_NEED_X += test-line-buffer
 TEST_PROGRAMS_NEED_X += test-svn-fe