diff --git a/plantuml/erd-skin.ipu b/plantuml/erd-skin.ipu
new file mode 100644
index 0000000..0a89b0b
--- /dev/null
+++ b/plantuml/erd-skin.ipu
@@ -0,0 +1,14 @@
+' Overrides for ERDs, which otherwise inherit the class settings.
+
+skinparam {
+
+    ' Need the class attribute icon to show the "not null" symbol.
+    ClassAttributeIconSize default
+
+    ' Ortho causes problems with positioning of labels, but it
+    ' looks better in general. Be careful! Apparently a GraphViz
+    ' issue (https://github.com/plantuml/plantuml/issues/149).
+    LineType ortho
+}
+
+hide methods