diff --git a/pcbdevice/gcode/GcodeBuilder.py b/pcbdevice/gcode/GcodeBuilder.py
index ce28059..603bc16 100644
--- a/pcbdevice/gcode/GcodeBuilder.py
+++ b/pcbdevice/gcode/GcodeBuilder.py
@@ -1,4 +1,12 @@
 def listToGCode(listIndex, pHeight, pWidth):
+	"""
+	Convert a list of matrix coordinate in a list of GCode commands
+	
+	:param listIndex: List of coordinate
+	:param pHeight: Pixel height in mm
+	:param pWidth: Pixel width in mm
+	:return: List of all the GCode commands
+	"""
 	gcodeCommand = []
 	toolUp = True
 	
diff --git a/pcbdevice/utils/FileUtils.py b/pcbdevice/utils/FileUtils.py
index 3014aa9..80648fb 100644
--- a/pcbdevice/utils/FileUtils.py
+++ b/pcbdevice/utils/FileUtils.py
@@ -3,6 +3,16 @@ import math
 class FileUtils:
 	@staticmethod
 	def pbmToMatrix(pbmFilePath, dimensionLineIndex = 2):
+		"""
+		Read a pbm file and convert in an int matrix
+		
+		:param str pbmFilePath: Path of the ascii pbm file to convert in a matrix
+		:param int dimensionLineIndex: Line index containing the dimension of the image
+		:return matrix: Matrix with image value
+		:return height: Height of the matrix
+		:return width: Width of the matrix
+		"""
+		
 		completeFile = []
 		
 		file = open(pbmFilePath, 'r')
@@ -22,6 +32,13 @@ class FileUtils:
 	
 	@staticmethod
 	def saveMatrixToFile(matrix, filePath):
+		"""
+		Save a matrix in a plain text file
+		
+		:param matrix: Matrix to save
+		:param filePath: Path of the output file
+		:return: None
+		"""
 		with open(filePath, 'w') as f:
 			for x in matrix:
 				for y in x:
@@ -31,6 +48,13 @@ class FileUtils:
 			
 	@staticmethod
 	def saveStringListToFile(stringList, filePath):
+		"""
+		Save a string list into a plain text file with a carriage return after each entry
+		
+		:param stringList: List of string to write
+		:param filePath: File path to write the text
+		:return: None
+		"""
 		with open(filePath, 'w') as f:
 			for line in stringList:
 				f.write('%s\n' % line)
@@ -38,6 +62,18 @@ class FileUtils:
 			
 	@staticmethod
 	def getPixelSize(matHeight, matWidth, pcbHeight, pcbWidth, unit = 'mm'):
+		"""
+		Get pixel width and height with the real image size
+		
+		:param matHeight: Height of the image matrix (Nb pixels)
+		:param matWidth: Width of the image matrix (Nb pixels)
+		:param pcbHeight: True height of the image (PCB)
+		:param pcbWidth: True width of the image (PCB)
+		:param unit: Unit of the size of the image, default in mm
+		:return pixelHeight: Pixel height in mm
+		:return pixelWidth: Pixel width in mm
+		
+		"""
 		if unit == 'mm':
 			return pcbHeight / matHeight, pcbWidth / matWidth
 		elif unit == 'cm':
diff --git a/pcbdevice/utils/TestUtils.py b/pcbdevice/utils/TestUtils.py
index 384e50d..a8f1dce 100644
--- a/pcbdevice/utils/TestUtils.py
+++ b/pcbdevice/utils/TestUtils.py
@@ -1,4 +1,10 @@
 def readIntFile(filePath):
+	"""
+	Read a matrix file
+	
+	:param filePath: File path to read from
+	:return: The matrix in int
+	"""
 	completeFile = []
 	file = open(filePath, 'r')
 	lines = file.readlines()
@@ -14,6 +20,12 @@ def readIntFile(filePath):
 	return completeFile
 
 def readStringFile(filePath):
+	"""
+	Read all lines of a file
+	
+	:param filePath: File path to read from
+	:return: Array of all lines in the file
+	"""
 	file = open(filePath, 'r')
 	lines = file.readlines()
 	file.close()