diff --git a/.gitmodules b/.gitmodules
index d1d5c48..6790fd5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -31,3 +31,6 @@
 [submodule "extras/libesphttpd/libesphttpd"]
 	path = extras/libesphttpd/libesphttpd
 	url = https://github.com/nochkin/libesphttpd
+[submodule "extras/libesphttpd/libesphttpd/lib/heatshrink"]
+	path = extras/libesphttpd/libesphttpd/lib/heatshrink
+	url = https://github.com/atomicobject/heatshrink