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If it is difficult to visualize where the column headers start, it might help to import the annotation file into a spreadsheet viewing program such as Microsoft Excel or Google Sheets. 

• Right click the spreadsheet you want to annotate in the spreadsheet tree panel
• Select Properties from the pop-up menu (Figure 2)
  
  

Depending on how you imported the data, you may see a Configure Spreadsheet dialog (Figure 3). Select the most appropriate option for your data; here we have chosen Genomic microarray. 

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• Select Close to return to the Configure Genomic Properties
  

The Chip/Reference text field will be populated with the annotation file name. You can edit this text field this if you wish. 

• Select the species and genome from the Species and Genome Build section of the dialog; we have chosen Homo sapiens and hg19 (Figure 4)
  
  

• Select OK apply the annotation file to your data spreadsheet

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• Right-click on a column in the annotated data file spreadsheet
• Select Insert Annotation from the pop-up menu (Figure 5)
  
  

The Column Configuration section of the Add Rows/Columns to Spreadsheet dialog should contain all the feature annotations from the annotation file spreadsheet (Figure 6). Here we selected ILMN_Gene, which will add gene name information as a column next to 1. ID_REF. 

Annotation features can also be added to the Genome Viewer as tracks. See (chapter on genome viewer) for an introduction to adding tracks. 

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