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 <function>stream_metadata</function>, to specify <function>chmod</function> call.
       </entry>
      </row>
+     <row xml:id="constant.stream-buffer-none">
+      <entry><constant>STREAM_BUFFER_NONE</constant></entry>
+      <entry>
+       No buffering.
+      </entry>
+     </row>
+     <row xml:id="constant.stream-buffer-line">
+      <entry><constant>STREAM_BUFFER_LINE</constant></entry>
+      <entry>
+       Line buffering.
+      </entry>
+     </row>
+     <row xml:id="constant.stream-buffer-full">
+      <entry><constant>STREAM_BUFFER_FULL</constant></entry>
+      <entry>
+       Full buffering.
+      </entry>
+     </row>
     </tbody>
    </tgroup>
   </informaltable>