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diff --git a/README.tru64 b/README.tru64
index 4eb6a00..d65175a 100644
--- a/README.tru64
+++ b/README.tru64
@@ -42,6 +42,12 @@ example the regular expressions are not thread-safe.  The bugs are
 very hard to fix are and therefore the 5.005 threads model is still
 classified as an experimental feature.
 
+=head2 Long Doubles on Tru64
+
+You cannot Configure Perl to use long doubles unless you have at least
+Tru64 V5.0, the long double support simply wasn't functional before
+that.
+
 =head2 64-bit Perl on Tru64
 
 In Tru64 Perl's integers are automatically 64-bit wide, there is
@@ -53,7 +59,7 @@ in INSTALL.  Similarly, there is no need for -Duse64bitall.
 When compiling Perl in Tru64 you may (depending on the compiler
 release) see two warnings like this
 
-    cc: Warning: util.c, line 3797: In this statement, floating-point overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
+    cc: Warning: numeric.c, line 104: In this statement, floating-point overflow occurs in evaluating the expression "1.8e308". (floatoverfl)
         return HUGE_VAL;
     -----------^