diff --git a/Docs/Dev/en/SUMMARY.md b/Docs/Dev/en/SUMMARY.md
index e69de29..8a97952 100755
--- a/Docs/Dev/en/SUMMARY.md
+++ b/Docs/Dev/en/SUMMARY.md
@@ -0,0 +1,3 @@
+# Developer Content
+
+* [Structure]({%}&page=Dev/structure)
diff --git a/Docs/Dev/en/structure.md b/Docs/Dev/en/structure.md
index e69de29..e7eea88 100755
--- a/Docs/Dev/en/structure.md
+++ b/Docs/Dev/en/structure.md
@@ -0,0 +1,5 @@
+# Structure
+
+## ER
+
+![ER](Modules/Tools/Docs/Dev/img/er.png)
\ No newline at end of file