diff --git a/CMakeLists.txt b/CMakeLists.txt
index 78e8c8ce2a..e7597fc87a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -192,6 +192,7 @@ option(WITH_EXAMPLES "Whether to build examples" ON)
 option(WITH_METRICS_PREVIEW "Whether to build metrics preview" OFF)
 option(WITH_LOGS_PREVIEW "Whether to build logs preview" OFF)
 option(WITH_ASYNC_EXPORT_PREVIEW "Whether enable async export" OFF)
+# Exemplar specs status is experimental, so behind feature flag by default
 option(WITH_METRICS_EXEMPLAR_PREVIEW
        "Whethere to enable exemplar within metrics" OFF)