diff --git a/src/main/java/org/apache/commons/math/util/FastMath.java b/src/main/java/org/apache/commons/math/util/FastMath.java
index 5da97fc87..9c097020d 100644
--- a/src/main/java/org/apache/commons/math/util/FastMath.java
+++ b/src/main/java/org/apache/commons/math/util/FastMath.java
@@ -2941,7 +2941,7 @@ public class FastMath {
      * Two arguments arctangent function
      * @param y ordinate
      * @param x abscissa
-     * @return phase angle of point (x,y) between -π and π
+     * @return phase angle of point (x,y) between {@code -PI} and {@code PI}
      */
     public static double atan2(double y, double x) {
         if (x !=x || y != y) {