diff --git a/Makefile b/Makefile
index cdcb487..e2af632 100644
--- a/Makefile
+++ b/Makefile
@@ -80,6 +80,7 @@ endif
 endif
 
 redis:
+ifneq ($(redis), on)
 ifneq ($(arch), riscv64)
 ifneq ($(shell uname), Darwin)
 	mkdir -p $(out_dir)
@@ -88,6 +89,7 @@ ifneq ($(shell uname), Darwin)
 	@cp redis/build/$(arch)/redis-cli $(out_dir)/redis-cli
 endif
 endif
+endif
 
 build: rust ucore biscuit $(busybox) nginx redis
 
diff --git a/README.md b/README.md
index cea5ef1..f57abd4 100644
--- a/README.md
+++ b/README.md
@@ -34,14 +34,14 @@ Output to `build/$(arch)`
 
 ## Support matrix
 
-|         | x86_64 | aarch64 | riscv32 | riscv64 |
-| ------- | ------ | ------- | ------- | ------- |
-| ucore   | n      | y       | y       | y       |
-| rust    | y      | y       | y       | y       |
-| biscuit | y      | y       | n       | y       |
-| nginx   | y      | y       | n       | y       |
-| redis   | y      | y       | y       | n       |
-| busybox | y      | y       | n       | y       |
+|                             | x86_64 | aarch64 | riscv32 | riscv64 |
+| --------------------------- | ------ | ------- | ------- | ------- |
+| ucore                       | n      | y       | y       | y       |
+| rust                        | y      | y       | y       | y       |
+| biscuit                     | y      | y       | n       | y       |
+| nginx                       | y      | y       | n       | y       |
+| redis (build with redis=on) | y      | y       | y       | n       |
+| busybox                     | y      | y       | n       | y       |