diff --git a/ROADMAP.md b/ROADMAP.md
index 7865e7f..74ecf17 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -145,7 +145,7 @@
 - [X] "no-mixed-spaces-and-tabs"
 - [ ] "no-multi-assign"
 - [X] "no-multi-spaces"
-- [ ] "no-multi-str"
+- [X] "no-multi-str"
 - [X] "no-multiple-empty-lines"
 - [X] "no-native-reassign"
 - [ ] "no-negated-condition"
diff --git a/src/rules/default.json b/src/rules/default.json
index 8f2d02a..504747e 100644
--- a/src/rules/default.json
+++ b/src/rules/default.json
@@ -276,6 +276,9 @@
       "ignoreEOLComments": false
     }
   ],
+  "no-multi-str": [
+    "error"
+  ],
   "no-multiple-empty-lines": [
     "error",
     {