diff --git a/demo/app/src/main/resources/log4j.properties b/demo/app/src/main/resources/log4j.properties
index 16ce034..77666ae 100644
--- a/demo/app/src/main/resources/log4j.properties
+++ b/demo/app/src/main/resources/log4j.properties
@@ -4,7 +4,9 @@ log4j.rootLogger=DEBUG, Console
 # PF4J log
 #
 log4j.logger.ro.fortsoft.pf4j=DEBUG, Console
+# !!! Put the bellow classes on level TRACE when you are in trouble
 log4j.logger.ro.fortsoft.pf4j.PluginClassLoader=WARN, Console
+log4j.logger.ro.fortsoft.pf4j.AbstractExtensionFinder=DEBUG, Console
 log4j.additivity.ro.fortsoft.pf4j=false
 
 #