diff --git a/src/Trace/SpanContext.php b/src/Trace/SpanContext.php
index 3bd9b9b0307..8773cd4b34a 100644
--- a/src/Trace/SpanContext.php
+++ b/src/Trace/SpanContext.php
@@ -51,6 +51,11 @@ class SpanContext
      * @var bool|null Whether or not tracing is enabled for this request.
      */
     private $enabled;
+    
+    /**
+     * @var bool Whether or not the context was detected from an incoming header.
+     */
+    private $fromHeader;
 
     /**
      * Creates a new SpanContext instance