Documentation for 'Quick select' buttons on top of query page on cBio…

…Portal

docs/deployment/customization/portal.properties-Reference.md

@@ -143,6 +143,18 @@ Prevent users from saving data by removing all Download tabs and download and co
 skin.hide_download_controls=
 ```
 
+### Quick select buttons 
+
+This feature allows you to generate a Quick Select button on the top of your query page. The button, when clicked on, will automatically select the studies mentioned after the '#`. 
+
+```
+skin.quick_select_buttons=
+```
+
+The format for the string should be ``<Button name>|<Mouse-over text>#study1a,study1b,....`` where:
+- <Button name> will be the label on the button (for e.g. TCGA PanCancer Atlas Studies, Curated set of non-redundant studies)
+- <Mouse-over text> will be the text that is displayed when you hover over the button (for e.g. 218 studies that are manually curated including TCGA and non-TCGA studies with no overlapping samples) 
+- study1a,study1b,.... are the study IDs of the loaded studies that should be selected when the button is clicked. (for e.g. acbc_mskcc_2015,acc_tcga_pan_can_atlas_2018)
 
 
 ### Control default setting for filtering of genes in mutation and CNA tables of patient view