Minor doc change

src/cache.rs

@@ -77,7 +77,7 @@ fn load_sql() -> Result<Vec<Cache>, CacheError> {
     Ok(results)
 }
 
-/// SQL cache function to be called by `get_data`.
+/// SQL cache function to be called by `get_data` (read) and `api_client` (write).
 pub fn sql_cache() {
     let data = match load_sql() {
         Ok(data) => data,