diff --git a/reference/stream/constants.xml b/reference/stream/constants.xml
index c1bb9bb745..a09fbb4709 100644
--- a/reference/stream/constants.xml
+++ b/reference/stream/constants.xml
@@ -359,6 +359,24 @@
Used with stream_metadata, to specify chmod call.
+
+ STREAM_BUFFER_NONE
+
+ No buffering.
+
+
+
+ STREAM_BUFFER_LINE
+
+ Line buffering.
+
+
+
+ STREAM_BUFFER_FULL
+
+ Full buffering.
+
+