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diff --git a/exercises/assignment12.mdwn b/exercises/assignment12.mdwn
index 58068c4f..02a78ac7 100644
--- a/exercises/assignment12.mdwn
+++ b/exercises/assignment12.mdwn
@@ -290,6 +290,7 @@ Here are the beginnings of functions to move from one focused tree to another:
         # next2 ();;
         - : int option = None
 
+<a id=streams1></a>
 ## Same-fringe using streams ##
 
 Now we'll describe a different way to create "the little subprograms" that we built above with `make_fringe_enumerator`. This code will make use of a data structure called a "stream". A stream is like a list in that it wraps a series of elements of a single type. It differs from a list in that the tail of the series is left uncomputed until needed. We turn the stream off and on by thunking it, nad by forcing the thunk.
@@ -364,6 +365,7 @@ Some other Scheme details or reminders:
 
 <!-- -->
 
+<a id=streams2></a>
 4.  Here is the Scheme code handling the same-fringe problem. You should fill in the blanks:
 
         (define (lazy-flatten tree)