diff --git a/README.md b/README.md
index 2718518..9acdf28 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
-#Basic functions
+# Minetest mod: Basic functions
 
 Main repository:
 
@@ -11,17 +11,17 @@ https://gitlab.com/ademant/basic_functions.git
 
 https://github.com/ademant/basic_functions.git
 
-##Short description
+## Short description
 Mod provide some functions, I need for several mods. Basically for import spreadsheet configurations.
 
-##short api:
+## short api:
 function has_value(tab,val)
 	check if val is inside list tab
 
 function import_csv(infile,def)
 	read configuration from infile
 	def.as_numeric: all values not stated in col_num, col_tab or with name "name" are interpreted as numeric
-	def.seperator: character to use as field delimiter
+	def.seperator: character to use as field delimiter in infile
 	def.col_num: turn this elements to numbers
 	def.groups_num: put this elements as numbers into matrix groups
 
diff --git a/functions.lua b/functions.lua
index 2a00033..fbb7d15 100644
--- a/functions.lua
+++ b/functions.lua
@@ -12,6 +12,7 @@ end
 local has_value=basic_functions.has_value
 
 -- read table "infile" where in "def" is defined, which cols are numbers and which belongs to a group
+-- First line has to be the header.
 -- def.as_numeric: all values not stated in col_num, col_tab or with name "name" are interpreted as numeric
 -- def.seperator: character to use as field delimiter
 -- def.col_num: turn this elements to numbers