Generate Robot framerwork keyword documentation from custom library?

Let say, I've created my own python library for robot framework and now I want to generate documentation from the python class file.

How to do it?

Step 1:
In python, add your documentation

def delete_excel_row(self, varFileName, varSheetName, varCellName):

"""

Delete a row in the excel file.

Arguments:

| FileName | Excel file with full path |

| SheetName | Sheetname in the excel file |

| CellValue | Row to be deleted in the sheet |

Example:

Delete row

| Delete Excel Row | C:\\Python27\\ExcelRobotTest\\ExcelRobotTest.xlsx | Sheet1 | A1 |

"""

self.varFileName = varFileName

self.varSheetName = varSheetName

self.varCellName = varCellName

varExcel = win32com.client.DispatchEx('Excel.Application')

varWB = varExcel.Workbooks.Open(self.varFileName)

varSheet = varWB.Sheets(self.varSheetName)

varSheet.Range(self.varCellName).EntireRow.Delete(Shift=-4162)

varWB.Save()

varWB.Close()

varExcel.Quit()

Step 2:
Now generate documentation using command

 python -m robot.libdoc filename.py  filename.html