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-rw-r--r--doc/man3/EVP_PKEY_gettable_params.pod6
1 files changed, 5 insertions, 1 deletions
diff --git a/doc/man3/EVP_PKEY_gettable_params.pod b/doc/man3/EVP_PKEY_gettable_params.pod
index b28ed69939..23ac4bd8b0 100644
--- a/doc/man3/EVP_PKEY_gettable_params.pod
+++ b/doc/man3/EVP_PKEY_gettable_params.pod
@@ -52,11 +52,15 @@ buffer I<str> of maximum size I<max_buf_sz> associated with a name of
I<key_name>. The maximum size must be large enough to accomodate the string
value including a terminating NUL byte, or this function will fail.
If I<out_len> is not NULL, I<*out_len> is set to the length of the string
-not including the terminating NUL byte.
+not including the terminating NUL byte. The required buffer size not including
+the terminating NUL byte can be obtained from I<*out_len> by calling the
+function with I<str> set to NULL.
EVP_PKEY_get_octet_string_param() get a key I<pkey>'s octet string value into a
buffer I<buf> of maximum size I<max_buf_sz> associated with a name of I<key_name>.
If I<out_len> is not NULL, I<*out_len> is set to the length of the contents.
+The required buffer size can be obtained from I<*out_len> by calling the
+function with I<buf> set to NULL.
=head1 NOTES