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-rw-r--r--doc/crypto/EVP_DigestVerifyInit.pod9
1 files changed, 5 insertions, 4 deletions
diff --git a/doc/crypto/EVP_DigestVerifyInit.pod b/doc/crypto/EVP_DigestVerifyInit.pod
index e0217e40cba8..0ead2d2f8aa1 100644
--- a/doc/crypto/EVP_DigestVerifyInit.pod
+++ b/doc/crypto/EVP_DigestVerifyInit.pod
@@ -37,10 +37,11 @@ EVP_DigestVerifyInit() and EVP_DigestVerifyUpdate() return 1 for success and 0
or a negative value for failure. In particular a return value of -2 indicates
the operation is not supported by the public key algorithm.
-Unlike other functions the return value 0 from EVP_DigestVerifyFinal() only
-indicates that the signature did not verify successfully (that is tbs did
-not match the original data or the signature was of invalid form) it is not an
-indication of a more serious error.
+EVP_DigestVerifyFinal() returns 1 for success; any other value indicates
+failure. A return value of zero indicates that the signature did not verify
+successfully (that is, tbs did not match the original data or the signature had
+an invalid form), while other values indicate a more serious error (and
+sometimes also indicate an invalid signature form).
The error codes can be obtained from L<ERR_get_error(3)|ERR_get_error(3)>.