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-rw-r--r--shared/src/com/vaadin/shared/ApplicationConstants.java4
1 files changed, 3 insertions, 1 deletions
diff --git a/shared/src/com/vaadin/shared/ApplicationConstants.java b/shared/src/com/vaadin/shared/ApplicationConstants.java
index 9f723763f8..da4ac7450d 100644
--- a/shared/src/com/vaadin/shared/ApplicationConstants.java
+++ b/shared/src/com/vaadin/shared/ApplicationConstants.java
@@ -111,7 +111,9 @@ public class ApplicationConstants implements Serializable {
public static final String CSRF_TOKEN = "csrfToken";
/**
- * The name of the parameter used to transmit the sync id
+ * The name of the parameter used to transmit the sync id. The value can be
+ * set to -1 e.g. when testing with pre-recorded requests to make the
+ * framework ignore the sync id.
*
* @see com.vaadin.ui.ConnectorTracker#getCurrentSyncId()
* @since 7.2