diff --git a/resources/compiled_coffeescript.zip b/resources/compiled_coffeescript.zip
index dc290df6e3..ceef59650d 100644
Binary files a/resources/compiled_coffeescript.zip and b/resources/compiled_coffeescript.zip differ
diff --git a/src/calibre/ebooks/oeb/display/paged.coffee b/src/calibre/ebooks/oeb/display/paged.coffee
index f4dcf4309e..8fa1caf8ea 100644
--- a/src/calibre/ebooks/oeb/display/paged.coffee
+++ b/src/calibre/ebooks/oeb/display/paged.coffee
@@ -225,6 +225,8 @@ class PagedDisplay
             this.scroll_to_xpos(absleft(elem) + 5)
 
     snap_to_selection: () ->
+        # Ensure that the viewport is positioned at the start of the column
+        # containing the start of the current selection
         sel = window.getSelection()
         r = sel.getRangeAt(0).getBoundingClientRect()
         node = sel.anchorNode