diff --git a/sql/clusters.dot b/sql/clusters.dot
index bf611b24..ac34985d 100644
--- a/sql/clusters.dot
+++ b/sql/clusters.dot
@@ -1,61 +1,64 @@
 subgraph cluster_meta {
 	label = "Meta";
 	dbversion;
 }
 
 subgraph cluster_content {
 	label = "Content";
 	content;
 }
 
 subgraph cluster_directory {
 	label = "Directories";
 	directory;
 	directory_entry_dir;
 	directory_entry_file;
 	directory_entry_rev;
 	directory_list_dir;
 	directory_list_file;
 	directory_list_rev;
 }
 
-directory_entry_file -> content;
-directory_entry_rev -> revision;
-
 subgraph cluster_revision {
 	label = "Revisions";
 	revision;
 	revision_history;
 	person;
 }
 
-revision -> directory;
-
 subgraph cluster_release {
 	label = "Releases";
 	release;
 }
 
 subgraph cluster_occurrences {
 	label = "Occurrences";
 	occurrence;
 	occurrence_history;
 }
 
 subgraph cluster_origins {
 	label = "Origins";
 	origin;
 	fetch_history;
 }
 
 subgraph cluster_projects {
 	label = "Projects";
 	project;
 	project_history;
 }
 
 subgraph cluster_organization {
 	label = "Organizations";
 	organization;
 	list_history;
 }
+
+{
+	edge [style = dashed];
+
+	directory_entry_file -> content;
+	directory_entry_rev -> revision;
+	revision -> directory;
+}