diff --git a/build_openwrt.md b/build_openwrt.md
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-Update feeds
-
-    ./scripts/feeds update -a
-    ./scripts/feeds install -a
-
-If you use chaos_calmer(15.05), you need to modify the Makefile: feeds/packages/utils/rtty/Makefile
-
-    PKG_SOURCE_PROTO:=git
-    PKG_SOURCE_VERSION:=v$(PKG_VERSION)
-    PKG_SOURCE_URL=https://github.com/zhaojh329/rtty.git
-    # Add the following two lines
-    PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-    PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
-    # And comment the line below
-    #PKG_MIRROR_HASH:=23a203351fdd47acfd16d3c3b3e3d51dd65a5d9e8ca89d4b1521d40c40616102
-
-Select rtty in menuconfig and compile new image.
-
-    Utilities  --->
-        Terminal  --->
-            < > rtty-mbedtls............................ A reverse proxy WebTTY (mbedtls)
-            <*> rtty-nossl............................... A reverse proxy WebTTY (NO SSL)
-            < > rtty-openssl............................ A reverse proxy WebTTY (openssl)
-            < > rtty-wolfssl............................ A reverse proxy WebTTY (wolfssl)
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