diff --git a/.gitignore b/.gitignore
index c757d93..182637c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 
 docgen
 docs/.source_hashes
+**/.source_hashes
diff --git a/Readme.md b/Readme.md
index e872758..e1993de 100644
--- a/Readme.md
+++ b/Readme.md
@@ -2,6 +2,7 @@
 
 Libraries for Metal makers
 
+- [Index](./docs/Topics.md)
 - [Documentation](./docs/metalib.scad.md)