diff --git a/src/main/java/net/e175/klaus/solarpositioning/PSA.java b/src/main/java/net/e175/klaus/solarpositioning/PSA.java
index <HASH>..<HASH> 100644
--- a/src/main/java/net/e175/klaus/solarpositioning/PSA.java
+++ b/src/main/java/net/e175/klaus/solarpositioning/PSA.java
@@ -17,6 +17,8 @@ import java.util.TimeZone;
  * minutes of arc for the period 1999–2015."

  * 

  * @author Klaus A. Brunner

+ *

+ * @deprecated PSA shouldn't be used after the year 2015.

  * 

  */

 public final class PSA {
add "soft" deprecation, as PSA's time is running out