--- a/master/coords.html	Fri Jan 27 11:57:58 2012 +0100
+++ b/master/coords.html	Fri Feb 10 09:45:46 2012 +1100
@@ -984,6 +984,10 @@
     <h2 id="Units">Units</h2>
     <p>All coordinates and lengths in SVG can be specified with or
     without a <span class="SVG-Term">unit identifier</span>.</p>
+    <p class="issue">
+      This is misleading – path data for example takes values that look
+      like coordinates and lengths yet does not allow units.
+    </p>
     <p>When a coordinate or length value is a number without a unit
     identifier (e.g., "25"), then the given coordinate or length is
     assumed to be in user units (i.e., a value in the current user