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diff --git a/INSTALL b/INSTALL
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--- a/INSTALL
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@@ -604,6 +604,20 @@ line so that the hint files can make appropriate adjustments.
The default is to compile without thread support.
+As of v5.5.64, perl has two different internal threads implementations.
+The 5.005 version (5005threads) and an interpreter-based implementation
+(ithreads) with one interpreter per thread. By default, Configure selects
+ithreads if -Dusethreads is specified. However, you can select the old
+5005threads behavior instead by either
+
+ sh Configure -Dusethreads -Duse5005threads
+
+or by
+ sh Configure -Dusethreads -Uuseithreads
+
+Eventually (by perl v5.6.0) this internal confusion ought to disappear,
+and these options may disappear as well.
+
=head2 Selecting File IO mechanisms
Previous versions of perl used the standard IO mechanisms as defined in