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-rw-r--r--doc/crypto/EVP_PKEY_cmp.pod4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/crypto/EVP_PKEY_cmp.pod b/doc/crypto/EVP_PKEY_cmp.pod
index 0ff027c0d5f9..f8e7ff1039ee 100644
--- a/doc/crypto/EVP_PKEY_cmp.pod
+++ b/doc/crypto/EVP_PKEY_cmp.pod
@@ -21,7 +21,9 @@ parameters of B<pkey> are missing and 0 if they are present or the algorithm
doesn't use parameters.
The function EVP_PKEY_copy_parameters() copies the parameters from key
-B<from> to key B<to>.
+B<from> to key B<to>. An error is returned if the parameters are missing in
+B<from> or present in both B<from> and B<to> and mismatch. If the parameters
+in B<from> and B<to> are both present and match this function has no effect.
The function EVP_PKEY_cmp_parameters() compares the parameters of keys
B<a> and B<b>.