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diff --git a/doc/gawktexi.in b/doc/gawktexi.in
index 89c4e7bf..e919df60 100644
--- a/doc/gawktexi.in
+++ b/doc/gawktexi.in
@@ -6111,6 +6111,10 @@ strings or string constants. They may also be passed through indirect function
calls (@pxref{Indirect Calls})
onto the built-in functions that accept regexp constants.
+When used in numeric conversions, strongly typed regexp variables convert
+to zero. When used in string conversions, they convert to the string
+value of the original regexp text.
+
@node Regexp Summary
@section Summary