* doc/gpgme.texi (gpgme_sigsum_t summary): Clarify what "you
can check one bit means"
--
It was unclear which bit to test for is. And tests
with students have shown that they would "test" for
this one bit by using if(sig.summary == GPGME_SIGSUM_VALID)
which would fail because valid sigs are also SIGSUM_GREEN.
So lets give an example for people not used to checking bits and
clarify through this example which bit is meant to be checked.
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