diff --git a/entity_map_json.hpp b/entity_map_json.hpp
index 0e9be01..11530bf 100644
--- a/entity_map_json.hpp
+++ b/entity_map_json.hpp
@@ -9,6 +9,14 @@
 {
 
 /**
+ * @brief Open the default entity map json file, and if present and valid json,
+ * return a built entity map.
+ *
+ * @return the map
+ */
+EntityInfoMap buildEntityMapFromFile();
+
+/**
  * @brief Given json data validate the data matches the expected format for the
  * entity map configuration and parse the data into a map of the entities.
  *