More verbose doc string for haskell-session-assign

Author: geraldus

haskell-session.el

@@ -87,7 +87,11 @@
         "haskell")))
 
 (defun haskell-session-assign (session)
-  "Set the current session."
+  "Assing current buffer to SESSION.
+More verbose doc string for `haskell-session-assign`
+This could be helpfull for temporal or auxilar buffers such as
+presentation mode buffers (e.g. in case when session is killed
+with all relevant buffers)."
   (set (make-local-variable 'haskell-session) session))
 
 (defun haskell-session-choose ()