diff -r abaa68df90f4 -r 1d383b4c0a23 doc/svghmi/syntax.rst
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+Widget syntax
+=============
+
+.. highlight:: text
+
+HMI elements are SVG elements whose labels start with ``HMI:``::
+
+    HMI:WidgetType[|freq][[:param]...][[@a=path[,min][,max]]...][#expression]
+
+Widget Type
+-----------
+
+Update Frequency
+----------------
+
+Parameters
+----------
+
+Variable bindings
+-----------------
+
+Enable expression
+-----------------
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