diff --git a/aspectratios.go b/aspectratios.go
new file mode 100644
index 0000000..c60f050
--- /dev/null
+++ b/aspectratios.go
@@ -0,0 +1,4 @@
+package frameproto
+
+const AspectRatioOnePointNineOneToOne = "1.91:1"
+const AspectRatioOneToOne             = "1:1"