diff --git a/read.scm b/read.scm
index 8d68093..a8b8c50 100644
--- a/read.scm
+++ b/read.scm
@@ -436,10 +436,18 @@
                                      port))))))
     loop))
 
+;;; Reads the next toplevel datum, discards it, and then continues at the
+;;; toplevel.
+(define readtable:datum-comment
+  (lambda (_ __ toplevel port)
+    (readtable:next toplevel #f port)
+    (readtable:next toplevel #f port)))
+
 (define readtable:hash
   (readtable:process
    (readtable:empty/default (readtable:error "unimplemented"))
    (list readtable:update #\| (readtable:jump/next readtable:block-comment))
+   (list readtable:update #\; readtable:datum-comment)
    (list readtable:update %bol readtable:vector)))
 
 ;;; ;;;;;;;;;;;;;;;;
@@ -498,3 +506,4 @@
 (read-all "(x y #| this is a block\n comment\n |# z w)")
 (read-all "#( a b #| this is a #| nested block |# comment|# z w)")
 (read-all "#(a b #(c #|close#|comment|#|#y))")
+(read-all "(this has a #;(call with current continuation) datum comment)")