Index: trunk/doc-rnd/TODO
===================================================================
--- trunk/doc-rnd/TODO	(revision 2661)
+++ trunk/doc-rnd/TODO	(revision 2662)
@@ -1,5 +1,5 @@
 - BUGS
-	- pcb-printf.h lacks doc about %.3mm
+	- visible grid slowing down rendering [Erich]
 	- bg image png crashes in extreme pan
 	- mac sw rendering slowdown [Chris]
 	- duplicate-element-on-copy bug: ctrl pressed? [James]
Index: trunk/src/pcb-printf.h
===================================================================
--- trunk/src/pcb-printf.h	(revision 2661)
+++ trunk/src/pcb-printf.h	(revision 2662)
@@ -62,6 +62,10 @@
  *          ONLY be used for debug code since its output exposes
  *          pcb's base units).
  *
+ * The usual printf(3) precision and length modifiers should work with
+ * any format specifier that outputs coords, e.g. %.3mm will output in
+ * mm up to 3 decimal digits after the decimal point.
+ *
  * KNOWN ISSUES:
  *   No support for %zu size_t printf spec
  */