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@@ -458,7 +458,9 @@ get_n_open_sockets(void)
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* localhost is inaccessible (for example, if the networking
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* stack is down). And even if it succeeds, the socket pair will not
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* be able to read while localhost is down later (the socket pair may
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- * even close, depending on OS-specific timeouts).
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+ * even close, depending on OS-specific timeouts). The socket pair
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+ * should work on IPv4-only, IPv6-only, and dual-stack systems, as long
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+ * as they have the standard localhost addresses.
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*
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* Returns 0 on success and -errno on failure; do not rely on the value
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* of errno or WSAGetLastError().
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