diff --git a/exercises/armstrong-numbers/canonical-data.json b/exercises/armstrong-numbers/canonical-data.json
index 0e8c59b774..269c29207f 100644
--- a/exercises/armstrong-numbers/canonical-data.json
+++ b/exercises/armstrong-numbers/canonical-data.json
@@ -19,6 +19,17 @@
       },
       "expected": true
     },
+    {
+      "uuid": "dc1db938-bd03-4aa7-96ad-e3b872bae3ed",
+      "description": "Single-digit numbers are Armstrong numbers",
+      "comments": ["Added hyphen"],
+      "reimplements": "579e8f03-9659-4b85-a1a2-d64350f6b17a",
+      "property": "isArmstrongNumber",
+      "input": {
+        "number": 5
+      },
+      "expected": true
+    },
     {
       "uuid": "2d6db9dc-5bf8-4976-a90b-b2c2b9feba60",
       "description": "There are no 2 digit Armstrong numbers",
@@ -28,6 +39,17 @@
       },
       "expected": false
     },
+    {
+      "uuid": "947a867a-943e-465f-b3f8-24f7973c97df",
+      "description": "There are no two-digit Armstrong numbers",
+      "comments": ["Added hyphen and made wording consistent"],
+      "reimplements": "2d6db9dc-5bf8-4976-a90b-b2c2b9feba60",
+      "property": "isArmstrongNumber",
+      "input": {
+        "number": 10
+      },
+      "expected": false
+    },
     {
       "uuid": "509c087f-e327-4113-a7d2-26a4e9d18283",
       "description": "Three digit number that is an Armstrong number",
@@ -37,6 +59,17 @@
       },
       "expected": true
     },
+    {
+      "uuid": "0c02b5cc-4cfc-49a2-bf45-332eb196c2ab",
+      "description": "Three-digit number that is an Armstrong number",
+      "comments": ["Added hyphen"],
+      "reimplements": "509c087f-e327-4113-a7d2-26a4e9d18283",
+      "property": "isArmstrongNumber",
+      "input": {
+        "number": 153
+      },
+      "expected": true
+    },
     {
       "uuid": "7154547d-c2ce-468d-b214-4cb953b870cf",
       "description": "Three digit number that is not an Armstrong number",
@@ -46,6 +79,17 @@
       },
       "expected": false
     },
+    {
+      "uuid": "3ac3c16c-124e-4491-986e-31203754e7bd",
+      "description": "Three-digit number that is not an Armstrong number",
+      "comments": ["Added hyphen"],
+      "reimplements": "7154547d-c2ce-468d-b214-4cb953b870cf",
+      "property": "isArmstrongNumber",
+      "input": {
+        "number": 100
+      },
+      "expected": false
+    },
     {
       "uuid": "6bac5b7b-42e9-4ecb-a8b0-4832229aa103",
       "description": "Four digit number that is an Armstrong number",
@@ -55,6 +99,17 @@
       },
       "expected": true
     },
+    {
+      "uuid": "5fddc80d-cce3-4ae2-bd2d-9f324d9aee96",
+      "description": "Four-digit number that is an Armstrong number",
+      "comments": ["Added hyphen"],
+      "reimplements": "6bac5b7b-42e9-4ecb-a8b0-4832229aa103",
+      "property": "isArmstrongNumber",
+      "input": {
+        "number": 9474
+      },
+      "expected": true
+    },
     {
       "uuid": "eed4b331-af80-45b5-a80b-19c9ea444b2e",
       "description": "Four digit number that is not an Armstrong number",
@@ -64,6 +119,17 @@
       },
       "expected": false
     },
+    {
+      "uuid": "79559dfa-83c8-4ce1-b63d-e13ce4a31983",
+      "description": "Four-digit number that is not an Armstrong number",
+      "comments": ["Added hyphen"],
+      "reimplements": "eed4b331-af80-45b5-a80b-19c9ea444b2e",
+      "property": "isArmstrongNumber",
+      "input": {
+        "number": 9475
+      },
+      "expected": false
+    },
     {
       "uuid": "f971ced7-8d68-4758-aea1-d4194900b864",
       "description": "Seven digit number that is an Armstrong number",
@@ -73,6 +139,17 @@
       },
       "expected": true
     },
+    {
+      "uuid": "daae0979-86d5-480f-95f1-b1dedcc6c1d2",
+      "description": "Seven-digit number that is an Armstrong number",
+      "comments": ["Added hyphen"],
+      "reimplements": "f971ced7-8d68-4758-aea1-d4194900b864",
+      "property": "isArmstrongNumber",
+      "input": {
+        "number": 9926315
+      },
+      "expected": true
+    },
     {
       "uuid": "7ee45d52-5d35-4fbd-b6f1-5c8cd8a67f18",
       "description": "Seven digit number that is not an Armstrong number",
@@ -81,6 +158,17 @@
         "number": 9926314
       },
       "expected": false
+    },
+    {
+      "uuid": "6d4032ea-b6c9-45e2-b67b-84e741c4bd9b",
+      "description": "Seven-digit number that is not an Armstrong number",
+      "comments": ["Added hyphen"],
+      "reimplements": "7ee45d52-5d35-4fbd-b6f1-5c8cd8a67f18",
+      "property": "isArmstrongNumber",
+      "input": {
+        "number": 9926314
+      },
+      "expected": false
     }
   ]
 }