diff --git a/src/config.c b/src/config.c
index db6996c..ba042d6 100644
--- a/src/config.c
+++ b/src/config.c
@@ -49,6 +49,15 @@ int init_config()
 	return 0;
 }
 
+/**
+ * get_config_string:
+ * @xpath: xpath expression to configuration node
+ *
+ * Gets a value defined in the configuration file.
+ *
+ * Return value: the value; or NULL if not found.  The string is internally
+ *     allocated.  It must not be freed or modified.
+ **/
 char* get_config_string(char *xpath)
 {
 	xmlXPathObjectPtr xpathObj;