diff --git a/README.md b/README.md
index 9acee73..0556a10 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,8 @@ http://prdownloads.sourceforge.net/ta-lib/ta-lib-0.4.0-src.tar.gz
 * build talib Linux Static Libraries
 * please check https://github.com/mingwugmail/talibd/blob/master/lib/Makefile
 ```
+$ git submodule update --init --recursive
+
 $ cd lib && make
 ```
 
diff --git a/lib/Makefile b/lib/Makefile
index 1d474b4..74e7d05 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -9,6 +9,12 @@
 # build the cmd version: use ta_libc_cmd.lib
 # ignore build error: undefined reference to `TA_IMI'
 
+# UPDATE(2023): use ta-lib-rt instead
+# ta-lib-rt/ta-lib-rt/build/lib/libta-lib-rt.a
+
+lib-rt:
+	cd ta-lib-rt && bash ./build.sh
+
 lib:
 	tar xzf ta-lib-code.tgz
 	cd ta-lib-code/ta-lib/c/make/cmd/linux/g++ && make clean && make