docs: add build subsystem to SUBSYSTEMS

Added both .gitignore and Makefile to build subsystem.

1 files changed, 1 insertions, 0 deletions

diff --git a/SUBSYSTEMS b/SUBSYSTEMS
index c727045..9160bf5 100644
--- a/SUBSYSTEMS
+++ b/SUBSYSTEMS
@@ -5,6 +5,7 @@ Make sure you follow the convention in each commit.
 The current subsystem and file matching are as follows:
 
 docs: SUBSYSTEMS
+build: Makefile .gitignore
 core: src/main.c
 parser: include/parser.h src/parser.c
 parser: um: include/um.h src/um.c