Javadoc for NullPointerExceptions

Signed-off-by: Jorge Bescos Gascon <jorge.bescos.gascon@oracle.com>

api/src/main/java/jakarta/json/spi/package-info.java

diff --git a/api/src/main/java/jakarta/json/spi/package-info.java b/api/src/main/java/jakarta/json/spi/package-info.java
index 00b6ad3..0420b9a 100644
--- a/api/src/main/java/jakarta/json/spi/package-info.java
+++ b/api/src/main/java/jakarta/json/spi/package-info.java
@@ -27,6 +27,10 @@
  *
  * <p>The API locates and loads providers using {@link java.util.ServiceLoader}.
  *
+ * Unless otherwise noted, passing a null argument to a constructor or method
+ * in any class or interface in this package will cause a NullPointerException
+ * to be thrown.
+ *
  * @since JSON Processing 1.0
  */
 package jakarta.json.spi;