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diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index a6496a8..2fbe669 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -1327,6 +1327,9 @@ The following exit codes are a defined, and can be used with
\function{_exit()}, although they are not required. These are
typically used for system programs written in Python, such as a
mail server's external command delivery program.
+\note{Some of these may not be available on all \UNIX{} platforms,
+since there is some variation. These constants are defined where they
+are defined by the underlying platform.}
\begin{datadesc}{EX_OK}
Exit code that means no error occurred.