details about the reference implementation see
<citerefentry><refentrytitle>sd-readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry></para>
- <para>If -DDISABLE_SYSTEMD is set during compilation
+ <para>If -DDISABLE_SYSTEMD is set during compilation,
this function will always return 0 and otherwise
become a NOP.</para>
</refsect1>