volBrain
diff --git a/‎README.md
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@@ -246,7 +246,7 @@ The Docker image has the following arguments:
 * `<input image or directory>`: it is possible to process a single image or all the images in an input directory. 
 * `<output directory>`: it is also possible to specify an output directory where the produced files will be saved. 
 * `[-age <age>]` and `[-sex <sex>]` allows to specify age and sex. Sex must be "Male" or "Female". Age is the age in years and should be a float. If an age is specified, the produced volumetry report report_*filename*.pdf will show the expected limits/normative bounds of normalized volumes in function of age. If both age and sex are specified, the expected limits of normalized volumes will be in function of age and sex. These bounds have been estimated over more than 3000 cognitively normal subjects. In case of abnormality, red values indicate volumes lower or bigger than normal at 95%. These options are mainly useful when processing exactly one image (see `-age-sex-csv` when processing several images).
-* `-age-sex-csv <input_csv_filename>`: specify input CSV filename with age and sex for all the input files when processing several files. The CSV file should have three columns: filename, age and sex, separated by commas. Each row of the filename column should contain the relative path of a file in the input directory. 
+* `-age-sex-csv <input_csv_filename>`: specify input CSV filename with age and sex for all the input files when processing several files. The CSV file should have at least three columns: filename, age and sex, separated by commas. The first row of the csv should start with "#" and contain the columns names. In the filename column, each filename should contain the relative path of a file in the input directory. 
 * `[-recursive]`: allows to specify that images will be searched recursively in input directory. 
 * `[-pattern-t1 <pattern>]`: allows to specify a pattern for images searched in input directory. The default is: \*.nii\*
 * `[-no-pdf-report]`: specify to produce no PDF format volumetry report.