diff --git a/README.md b/README.md
index ea3685d094..868fcff900 100644
--- a/README.md
+++ b/README.md
@@ -275,6 +275,10 @@ These instrumentations are hosted at <https://github.com/open-telemetry/opentele
 
 ## Upgrade guidelines
 
+### 0.27.x to 1.x.y
+
+- In `@opentelemetry/exporter-trace-otlp-http`, `OTLPExporterBase._isShutdown` is replaced with `_shutdownOnce`.
+
 ### 0.26.x to 0.27.x
 
 Metric and trace exporters are split into separate packages: