Add tip on keyboard shortcut to open recent file

core/prelude-core.el

@@ -374,6 +374,7 @@ Doesn't mess with special buffers."
 (defvar prelude-tips
   '("Press <C-c o> to open a file with external program."
     "Press <C-c p f> to navigate a project's files with ido."
+    "Press <s-r> to open a recently visited file."
     "Press <C-c p s g> to run grep on a project."
     "Press <C-c p p> to switch between projects."
     "Press <C-=> to expand the selected region."