Index: src/org/openstreetmap/josm/actions/mapmode/SelectLassoAction.java
===================================================================
--- src/org/openstreetmap/josm/actions/mapmode/SelectLassoAction.java	(revision 15446)
+++ src/org/openstreetmap/josm/actions/mapmode/SelectLassoAction.java	(working copy)
@@ -26,6 +26,7 @@
                 tr("Lasso selection mode: select objects within a hand-drawn region"),
                 Shortcut.registerShortcut("mapmode:lasso", tr("Mode: {0}", tr("Lasso Mode")), KeyEvent.CHAR_UNDEFINED, Shortcut.NONE),
                 ImageProvider.getCursor("normal", "rope"));
+        setHelpId(ht("/Action/LassoMode"));
     }
 
     @Override