diff --git a/exercises/practice/matrix/.meta/example.sml b/exercises/practice/matrix/.meta/example.sml
index 06e1190..dc49754 100644
--- a/exercises/practice/matrix/.meta/example.sml
+++ b/exercises/practice/matrix/.meta/example.sml
@@ -5,8 +5,8 @@ local
   val cells: string -> string list =
     String.tokens (fn (c: char) => c = #" ")
 
-    fun extract (index: int) (l: string list): string =
-      List.nth (l, index - 1)
+  fun extract (index: int) (l: string list): string =
+    List.nth (l, index - 1)
 in
   fun row (s: string, index: int): int list =
     map (valOf o Int.fromString) ((cells o extract index o lines) s)
@@ -14,3 +14,4 @@ in
   fun column (s: string, index: int): int list =
     map (valOf o Int.fromString o extract index o cells) (lines s)
 end
+
diff --git a/exercises/practice/matrix/matrix.sml b/exercises/practice/matrix/matrix.sml
index ce45ea8..8043862 100644
--- a/exercises/practice/matrix/matrix.sml
+++ b/exercises/practice/matrix/matrix.sml
@@ -3,3 +3,4 @@ fun row (s: string, index: int): int list =
 
 fun column (s: string, index: int): int list =
   raise Fail "'column' is not implemented"
+