---
 docs/libcurl/opts/CURLOPT_CAINFO.3 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/docs/libcurl/opts/CURLOPT_CAINFO.3 b/docs/libcurl/opts/CURLOPT_CAINFO.3
index cb7f47b..85c9ba3 100644
--- a/docs/libcurl/opts/CURLOPT_CAINFO.3
+++ b/docs/libcurl/opts/CURLOPT_CAINFO.3
@@ -47,7 +47,8 @@ All TLS based protocols: HTTPS, FTPS, IMAPS, POP3, SMTPS etc.
 .SH EXAMPLE
 TODO
 .SH AVAILABILITY
-If built TLS enabled
+For SSL engines that don't support certificate files the CURLOPT_CAINFO option
+is ignored. Refer to http://curl.haxx.se/docs/ssl-compared.html
 .SH RETURN VALUE
 Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
 CURLE_OUT_OF_MEMORY if there was insufficient heap space.
-- 
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