diff --git a/.gitmodules b/.gitmodules
index eadcc7a..95b6576 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "test4"]
 	path = test4
 	url = https://github.com/githubtraining/hellogitworld.git
+[submodule "esp-idf"]
+	path = esp-idf
+	url = https://github.com/espressif/esp-idf
diff --git a/esp-idf b/esp-idf
new file mode 160000
index 0000000..1cb31e5
--- /dev/null
+++ b/esp-idf
@@ -0,0 +1 @@
+Subproject commit 1cb31e50943bb757966ca91ed7f4852692a5b0ed