diff --git a/graph.h b/graph.h
index 14fd20de..8e597d8d 100644
--- a/graph.h
+++ b/graph.h
@@ -1,8 +1,42 @@
 #ifndef GRAPH_H
 #define GRAPH_H
 
+/*
+ * Description: does draw axis arrows and grid
+ *
+ * param:
+ *		- x0, y0, x1, y1:	location of arrows
+ *		- color:			color of arrows
+ *
+ * return: none
+ */
 void graphDrawSystem(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t color);
+
+/*
+ * Description: does draw coordinates into graph as dots
+ *
+ * param:
+ *		- coord:		two dimensionl array containing X and Y coordinates
+ *		- entries:		amount of coordinates passed (sizeof(coord)/sizeof(coord[0])
+ *		- radius:		size of the dots
+ *		- color:		color of the dots
+ *
+ * return: none
+ */
 void graphDrawDots(int16_t coord[][2], uint16_t entries, uint16_t radius, uint16_t color);
-void graphDrawNet(int16_t coord[][2], uint16_t entries, uint16_t radisu, uint16_t lineColor, uint16_t dotColor);
+
+/*
+ * Description: does draw coordinates into graph connected by lines
+ *
+ * param:
+ *		- coord:		two dimensional array containing X and Y coordinates
+ *		- entries:		amount of coordinates passed (sizeof(coord)/sizeof(coord[0])
+ *		- radius:		if not 0, graphDrawDots() gets invoked
+ *		- lineColor:	color of the lines
+ *		- dotColor:		color of dots, if radius != 0
+ *
+ * return: none
+ */	
+void graphDrawNet(int16_t coord[][2], uint16_t entries, uint16_t radius, uint16_t lineColor, uint16_t dotColor);
 
 #endif