diff --git a/lib/backbone/summary.js b/lib/backbone/summary.js
index 405c192a6..0d1d0d7a9 100644
--- a/lib/backbone/summary.js
+++ b/lib/backbone/summary.js
@@ -22,9 +22,6 @@ function TOCArticle(def, parent) {
     // ex: '1.0.0'
     this.level = def.level;
 
-    if (def.path && location.isExternal(def.path)) {
-        throw error.ParsingError(new Error('SUMMARY can only contains relative locations'));
-    }
     if (!def.title) {
         throw error.ParsingError(new Error('SUMMARY entries should have an non-empty title'));
     }