diff --git a/exercises/rectangles/canonical-data.json b/exercises/rectangles/canonical-data.json
index 401fb8997f..2670766b3f 100644
--- a/exercises/rectangles/canonical-data.json
+++ b/exercises/rectangles/canonical-data.json
@@ -1,26 +1,32 @@
 {
-  "#": [
+  "exercise": "rectangles",
+  "version": "1.0.0",
+  "comments": [
     "The inputs are represented as arrays of strings to improve readability in this JSON file.",
     "Your track may choose whether to present the input as a single string (concatenating all the lines) or as the list."
   ],
   "cases": [
     {
       "description": "no rows",
+      "property": "rectangles",
       "input": [],
       "expected": 0
     },
     {
       "description": "no columns",
+      "property": "rectangles",
       "input": [""],
       "expected": 0
     },
     {
       "description": "no rectangles",
+      "property": "rectangles",
       "input": [" "],
       "expected": 0
     },
     {
       "description": "one rectangle",
+      "property": "rectangles",
       "input": [
         "+-+",
         "| |",
@@ -30,6 +36,7 @@
     },
     {
       "description": "two rectangles without shared parts",
+      "property": "rectangles",
       "input": [
         "  +-+",
         "  | |",
@@ -41,6 +48,7 @@
     },
     {
       "description": "five rectangles with shared parts",
+      "property": "rectangles",
       "input": [
         "  +-+",
         "  | |",
@@ -52,6 +60,7 @@
     },
     {
       "description": "rectangle of height 1 is counted",
+      "property": "rectangles",
       "input": [
         "+--+",
         "+--+"
@@ -60,6 +69,7 @@
     },
     {
       "description": "rectangle of width 1 is counted",
+      "property": "rectangles",
       "input": [
         "++",
         "||",
@@ -69,6 +79,7 @@
     },
     {
       "description": "1x1 square is counted",
+      "property": "rectangles",
       "input": [
         "++",
         "++"
@@ -77,6 +88,7 @@
     },
     {
       "description": "only complete rectangles are counted",
+      "property": "rectangles",
       "input": [
         "  +-+",
         "    |",
@@ -88,6 +100,7 @@
     },
     {
       "description": "rectangles can be of different sizes",
+      "property": "rectangles",
       "input": [
         "+------+----+",
         "|      |    |",
@@ -99,6 +112,7 @@
     },
     {
       "description": "corner is required for a rectangle to be complete",
+      "property": "rectangles",
       "input": [
         "+------+----+",
         "|      |    |",
@@ -110,6 +124,7 @@
     },
     {
       "description": "large input with many rectangles",
+      "property": "rectangles",
       "input": [
         "+---+--+----+",
         "|   +--+----+",