Load providers registered through the ServiceLoader mechanism.

Change-Id: I392e78b34c8330e9b4c06d57b1423ca552ba6fc1
diff --git a/README.adoc b/README.adoc
index 79407cf..494f44c 100644
--- a/README.adoc
+++ b/README.adoc
@@ -144,6 +144,10 @@
 provide contextual information such as tracing and request IDs stored
 in thread-local storage.
 
+Alternatively, you can also register providers through the Java
+https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/ServiceLoader.html[ServiceLoader]
+mechanism.
+
 **Example:**
 
 [source,java]