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diff --git a/engine-intf.html b/engine-intf.html
index 8d5e700..3b7cb6c 100644
--- a/engine-intf.html
+++ b/engine-intf.html
@@ -1824,6 +1824,17 @@ 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.
 </p>
 
+<p class="version47">
+A question mark as the last character in the <b>pv</b> field should be used to indicate
+the reported score is from a fail low, and thus represents an upper bound only.
+Similarly, an exclamation point should be used to indicate a fail high / lower bound.
+</p>
+
+<p class="version47">
+Mate scores should be indicated as 100000 + N for "mate in N moves",
+and -100000 - N for "mated in N moves".
+</p>
+
 <p>
 Example:
 </p>