diff --git a/2.1/Cura/source/format b/2.1/Cura/source/format
new file mode 100644
index 0000000..9f67427
--- /dev/null
+++ b/2.1/Cura/source/format
@@ -0,0 +1 @@
+3.0 (native)
\ No newline at end of file
diff --git a/2.1/CuraEngine/source/format b/2.1/CuraEngine/source/format
new file mode 100644
index 0000000..9f67427
--- /dev/null
+++ b/2.1/CuraEngine/source/format
@@ -0,0 +1 @@
+3.0 (native)
\ No newline at end of file
diff --git a/2.1/Uranium/source/format b/2.1/Uranium/source/format
new file mode 100644
index 0000000..9f67427
--- /dev/null
+++ b/2.1/Uranium/source/format
@@ -0,0 +1 @@
+3.0 (native)
\ No newline at end of file
diff --git a/2.1/libArcus/source/format b/2.1/libArcus/source/format
new file mode 100644
index 0000000..9f67427
--- /dev/null
+++ b/2.1/libArcus/source/format
@@ -0,0 +1 @@
+3.0 (native)
\ No newline at end of file