diff --git a/.arclint b/.arclint
index 12bc550..f455265 100644
--- a/.arclint
+++ b/.arclint
@@ -1,41 +1,45 @@
 {
   "exclude": [
     "(^externals/)",
     "(\\.lint-test$)"
   ],
   "linters": {
     "filename": {
       "type": "filename"
     },
     "generated": {
       "type": "generated"
     },
     "merge-conflict": {
       "type": "merge-conflict"
     },
     "nolint": {
       "type": "nolint"
     },
     "phutil-xhpast": {
       "type": "phutil-xhpast",
       "include": "(\\.php$)"
     },
+    "phutil-library": {
+      "type": "phutil-library",
+      "include": "(\\.php$)"
+    },
     "text": {
       "type": "text"
     },
     "spelling": {
       "type": "spelling"
     },
     "xhpast": {
       "type": "xhpast",
       "include": "(\\.php$)",
       "severity": {
         "16": "advice",
         "29": "warning",
         "31": "error",
         "34": "error",
         "35": "error"
       }
     }
   }
 }