Documentation for ctx_set_ctlog_list_file()

Reviewed-by: Emilia Käsper <emilia@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>

apps/apps.h

diff --git a/apps/apps.h b/apps/apps.h
index 0fcac07..2f0b475 100644
--- a/apps/apps.h
+++ b/apps/apps.h
@@ -490,6 +490,12 @@
 __owur int ctx_set_verify_locations(SSL_CTX *ctx, const char *CAfile,
                                     const char *CApath, int noCAfile,
                                     int noCApath);
+
+/*
+ * Sets the file to load the Certificate Transparency log list from.
+ * If path is NULL, loads from the default file path.
+ * Returns 1 on success, 0 otherwise.
+ */
 __owur int ctx_set_ctlog_list_file(SSL_CTX *ctx, const char *path);
 
 # ifdef OPENSSL_NO_ENGINE