diff --git a/text/0000-build-observability.md b/text/0000-build-observability.md
index 17b1f945b..09cf2f940 100644
--- a/text/0000-build-observability.md
+++ b/text/0000-build-observability.md
@@ -328,6 +328,13 @@ Format](https://opentelemetry.io/docs/specs/otel/protocol/file-exporter/) is
 an official format, and matches the OTLP format nearly exactly (and thus seems
 unlikely to change), it is listed as experimental status.
 
+
+### Additional restricted layer name
+
+This RFC introduces `/layers/tracing/`. This means that buildpack authors will
+be unable to use this directory as a <layer_dir>, and lifecycle will need to
+prevent usage of this directory.
+
 # Alternatives
 [alternatives]: #alternatives