diff --git a/.gitmodules b/.gitmodules
index 41f7a19..e6dace0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -40,3 +40,6 @@
 [submodule "lib/zlib-ng"]
 	path = lib/zlib-ng
 	url = https://github.com/zlib-ng/zlib-ng
+[submodule "lib/ngx_dynamic_etag"]
+	path = lib/ngx_dynamic_etag
+	url = https://github.com/dvershinin/ngx_dynamic_etag
diff --git a/config.inc.sample b/config.inc.sample
index 54d5554..554c812 100644
--- a/config.inc.sample
+++ b/config.inc.sample
@@ -53,6 +53,9 @@ VTS=0
 ### zstd-nginx-module
 ZSTD=1
 
+### ngx_dynamic_etag
+DYNAMIC_ETAG=1
+
 ##########################
 ### nginx install path ###
 ##########################
diff --git a/lib/ngx_dynamic_etag b/lib/ngx_dynamic_etag
new file mode 160000
index 0000000..808ebb9
--- /dev/null
+++ b/lib/ngx_dynamic_etag
@@ -0,0 +1 @@
+Subproject commit 808ebb9124a31802c682201ea74bb085bb4b52ff