diff --git a/pkg/base-dev/mar/story-diff.hoon b/pkg/base-dev/mar/story-diff.hoon
new file mode 100644
index 000000000..17d417d36
--- /dev/null
+++ b/pkg/base-dev/mar/story-diff.hoon
@@ -0,0 +1,16 @@
+::
+::::
+  ::
+/-  *story
+|_  =story-diff
+::
+++  grad  %noun
+++  grow
+  |%
+  ++  noun  story-diff
+  --
+++  grab                                                ::  convert from
+  |%
+  ++  noun  ^story-diff                                 ::  make from %noun
+  --
+--
diff --git a/pkg/base-dev/mar/story.hoon b/pkg/base-dev/mar/story.hoon
index 4441dba1d..57051ca69 100644
--- a/pkg/base-dev/mar/story.hoon
+++ b/pkg/base-dev/mar/story.hoon
@@ -2,8 +2,6 @@
 /+  *story
 !:
 |_  tale=story
-+$  story-diff       [additions=story deletions=story]
-::
 ++  grad
   |%
   ++  form  %story-diff
diff --git a/pkg/base-dev/sur/story.hoon b/pkg/base-dev/sur/story.hoon
index f3aff0417..1336a616b 100644
--- a/pkg/base-dev/sur/story.hoon
+++ b/pkg/base-dev/sur/story.hoon
@@ -1,8 +1,9 @@
 ^?
 |%
-+$  prose    [title=@t body=@t]
-+$  proses   (set prose)
-+$  story    (jug tako:clay prose)         :: set len > 1 means conflicting messages have been assigned
-+$  chapter  [tako:clay proses]            :: prose entry type
-+$  cash     $%([%tako p=tako:clay] case)  :: used in generators to accept a tako directly as well
++$  prose       [title=@t body=@t]
++$  proses      (set prose)
++$  story       (jug tako:clay prose)              :: set len > 1 means conflicting messages have been assigned
++$  chapter     [tako:clay proses]                 :: prose entry type
++$  cash        $%([%tako p=tako:clay] case)       :: used in generators to accept a tako directly as well
++$  story-diff  [additions=story deletions=story]
 --
\ No newline at end of file