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-rw-r--r--manual/setjmp.texi5
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diff --git a/manual/setjmp.texi b/manual/setjmp.texi
index 710252881c..3ce202d024 100644
--- a/manual/setjmp.texi
+++ b/manual/setjmp.texi
@@ -294,6 +294,11 @@ the content of the registers, the signal mask, and the current stack.
Executing the contents would start at the point where the
@code{getcontext} call just returned.
+@strong{Compatibility Note:} Depending on the operating system,
+information about the current context's stack may be in the
+@code{uc_stack} field of @var{ucp}, or it may instead be in
+architecture-specific subfields of the @code{uc_mcontext} field.
+
The function returns @code{0} if successful. Otherwise it returns
@code{-1} and sets @var{errno} accordingly.
@end deftypefun