diff --git a/exercises/practice/difference-of-squares/.approaches/config.json b/exercises/practice/difference-of-squares/.approaches/config.json
index 94475754c2..01b59c1536 100644
--- a/exercises/practice/difference-of-squares/.approaches/config.json
+++ b/exercises/practice/difference-of-squares/.approaches/config.json
@@ -12,7 +12,10 @@
       "blurb": "Use LINQ to calculate the sums.",
       "authors": [
         "erikschierboom"
-      ]
+      ],
+      "tags": {
+        "all": ["uses:linq"]
+      }
     },
     {
       "uuid": "a6118dd7-26d5-4576-919f-11a584beeef8",
@@ -21,7 +24,10 @@
       "blurb": "Use a for statement to calculate the sums.",
       "authors": [
         "erikschierboom"
-      ]
+      ],
+      "tags": {
+        "all": ["construct:for-loop"]
+      }
     },
     {
       "uuid": "bdcb02d2-1a34-4a52-a80c-ca94907ba721",
@@ -30,7 +36,10 @@
       "blurb": "Use math to calculate the sums.",
       "authors": [
         "erikschierboom"
-      ]
+      ],
+      "tags": {
+        "all": ["technique:math"]
+      }
     }
   ]
 }