diff --git a/poc-datacollector/modules/ROOT/pages/index-src.adoc b/poc-datacollector/modules/ROOT/pages/index-src.adoc
index 7f99abe..5a386bd 100644
--- a/poc-datacollector/modules/ROOT/pages/index-src.adoc
+++ b/poc-datacollector/modules/ROOT/pages/index-src.adoc
@@ -6,10 +6,13 @@ image::ROOT:swarmlab-connect.png[float=right]
 * (1)  Opens the info  menu 
 * (2)  Run a shell in a running container
 * (3)  Opens web interface
-* (4),(5)  Source directory 
+* (4),(5)  Source directory -  Directory Maps
+
+"Directory Maps" are the preferred mechanism for persisting data generated by and used by Docker containers. We use here "bind mounts" and they are dependent on the directory structure and OS of the host machine.
 
 image::ROOT:types-of-mounts-bind.png[,250,float=right]
 
+WARNING: Your local changes to the files will be overwritten by click on "Download" button.
 
 == webclient