gstprotection: Add missing Since 1.6 mark

diff --git a/gst/gstprotection.h b/gst/gstprotection.h
index 1132164..fa22110 100644 (file)
--- a/gst/gstprotection.h
+++ b/gst/gstprotection.h
@@ -42,6 +42,8 @@ typedef struct _GstProtectionMeta GstProtectionMeta;
  *
  * Metadata type that holds information about a sample from a protection-protected
  * track, including the information needed to decrypt it (if it is encrypted).
+ *
+ * Since 1.6
  */
 struct _GstProtectionMeta
 {