Index: /trunk/src/org/openstreetmap/josm/data/projection/proj/AbstractProj.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/data/projection/proj/AbstractProj.java	(revision 9431)
+++ /trunk/src/org/openstreetmap/josm/data/projection/proj/AbstractProj.java	(revision 9432)
@@ -132,4 +132,10 @@
     }
 
+    /**
+     * Make sure longitude value is within <code>[-PI, PI]</code> range.
+     * @param lon the longitude in radians
+     * @return lon plus/minus multiples of <code>2*PI</code>, as needed to get
+     * in <code>[-PI, PI]</code> range
+     */
     public static double normalizeLon(double lon) {
         if (lon >= -Math.PI && lon <= Math.PI)
@@ -161,4 +167,7 @@
      * Computes function (15-9) and (9-13) from Snyder.
      * Equivalent to negative of function (7-7).
+     * @param lat the latitude
+     * @param sinlat sine of the latitude
+     * @return auxiliary value computed from <code>lat</code> and <code>sinlat</code>
      */
     final double tsfn(final double lat, double sinlat) {