diff --git a/doc/user/runtime/trace_spec.md b/doc/user/runtime/trace_spec.md
index c7daf4e..745dcb2 100644
--- a/doc/user/runtime/trace_spec.md
+++ b/doc/user/runtime/trace_spec.md
@@ -20,7 +20,7 @@ specified in the `pid` argument to `ovni_proc_init()`.
 Each process directory contains:
 
 - The metadata file `metadata.json`.
-- The thread streams with prefix `thread.`.
+- The thread streams like `thread.123.obs`.
 
 ## Process metadata