diff --git a/book/src/xdebug.md b/book/src/xdebug.md
index 11a6089..58079ca 100644
--- a/book/src/xdebug.md
+++ b/book/src/xdebug.md
@@ -19,7 +19,7 @@ IDE debugger configuration usually looks like:
 
 This would have to be adapted for detached instances.
 
-### Debugging all requests
+## Debugging all requests
 
 By default, Xdebug is configured to only run for requests that containing the
 trigger (e.g. from using the Xdebug browser extension, or adding
@@ -29,3 +29,8 @@ To enable Xdebug for all requests:
 
 - Un-comment the lines in `haze [cloud-id] edit /config/php.ini`
 - Then run `haze reload [cloud-id]`
+
+## Xdebug profile and trace files
+
+When enabling Xdebug trace or profile mode, the generated files can be found in
+`<work-dir>/<instance id>/xdebug`.