Index: trunk/src/org/openstreetmap/josm/data/projection/Mercator.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/projection/Mercator.java	(revision 1260)
+++ trunk/src/org/openstreetmap/josm/data/projection/Mercator.java	(revision 1261)
@@ -13,4 +13,7 @@
  * The center of the mercator projection is always the 0 grad
  * coordinate.
+ *
+ * See also USGS Bulletin 1532
+ * (http://egsc.usgs.gov/isb/pubs/factsheets/fs08799.html)
  *
  * @author imi