diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2ea4903..4378f51 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@
 ### Added
 - Theme of editor can be configured via plugin's settings (#65)
 
+### Changed
+- Update to Diagrams.net 14.7.4
+
 ## [0.1.7] - 2021-04-27
 
 ### Changed
diff --git a/src/webview/README.adoc b/src/webview/README.adoc
new file mode 100644
index 0000000..d480584
--- /dev/null
+++ b/src/webview/README.adoc
@@ -0,0 +1,27 @@
+= Sub-Modules
+
+This is a sub-module pointing to https://github.com/jgraph/drawio.
+
+== Why a submodules
+
+This allows tracking te upstream development in a relatively straightforward way.
+
+== How to update
+
+Run the following commands when you want to update it:
+
+----
+cd src/webview/drawio
+git checkout dev
+cd ..
+git add drawio
+git commit ...
+git push
+----
+
+Run the following commands for all other developers:
+
+----
+git pull
+git submodule update --init
+----
diff --git a/src/webview/drawio b/src/webview/drawio
index 20b7155..ae70958 160000
--- a/src/webview/drawio
+++ b/src/webview/drawio
@@ -1 +1 @@
-Subproject commit 20b7155d17a9b0f495da151b1ea3d591e69d9294
+Subproject commit ae709582f7ce7b6756a0318afd818aec8197d36e