Index: /applications/editors/josm/plugins/multipoly/src/multipoly/MultipolyAction.java
===================================================================
--- /applications/editors/josm/plugins/multipoly/src/multipoly/MultipolyAction.java	(revision 23891)
+++ /applications/editors/josm/plugins/multipoly/src/multipoly/MultipolyAction.java	(revision 23892)
@@ -61,6 +61,8 @@
     Collection < Way > selectedWays = Main.main.getCurrentDataSet().getSelectedWays();
 
-    if (selectedWays.size() < 2) {
-      JOptionPane.showMessageDialog(Main.parent, tr("You must select at least two ways."));
+    if (selectedWays.size() < 1) {
+      // Sometimes it make sense creating multipoly of only one way (so it will form outer way)
+      // and then splitting the way later (so there are multiple ways forming outer way)
+      JOptionPane.showMessageDialog(Main.parent, tr("You must select at one way."));
       return;
     }