Put fail-high/fail-low indicators in protocol specs

diff --git a/engine-intf.html b/engine-intf.html
index 8d5e700..969495b 100644 (file)
--- a/engine-intf.html
+++ b/engine-intf.html
@@ -1824,6 +1824,12 @@ It is therefore encouraged that engines use tabs or spaces to format this option
 so that it will display nicely in (not too wide) columns.\r
 </p>\r
 \r
+<p class="version47">\r
+A question mark as the last character in the <b>pv</b> field should be used to indicate\r
+the reported score is from a fail low, and thus represents an upper bound only.\r
+Similarly, an exclamation point should be used to indicate a fail high / lower bound.\r
+</p>\r
+\r
 <p>\r
 Example:\r
 </p>\r