diff --git a/index.js b/index.js
index b59d40b..72109a8 100644
--- a/index.js
+++ b/index.js
@@ -27,13 +27,17 @@ module.exports = {
         languageHint : '',
         encodingHint : '',
         tldHint      : '',
-        httpHint     : ''
+        httpHint     : '',
+        bestEffort   : false
       };
       options = _.defaults({}, options, defaults);
 
       if (!_.isBoolean(options.isHTML)) {
         throw new Error('Invalid isHTML value');
       }
+      if (!_.isBoolean(options.bestEffort)) {
+        throw new Error('Invalid bestEffort value');
+      }
       if (!_.isString(options.languageHint)) {
         throw new Error('Invalid languageHint');
       }
@@ -64,7 +68,8 @@ module.exports = {
         options.languageHint,
         options.encodingHint,
         options.tldHint,
-        options.httpHint
+        options.httpHint,
+        options.bestEffort
       );
 
       if (result.languages.length < 1) {
diff --git a/src/cld.cc b/src/cld.cc
index 627e07e..fc6d343 100644
--- a/src/cld.cc
+++ b/src/cld.cc
@@ -19,6 +19,7 @@ namespace NodeCld {
       httpHint;
     int numBytes;
     bool isPlainText;
+    bool bestEffort;
   };
 
   struct CLDOutput {
@@ -52,6 +53,7 @@ namespace NodeCld {
     if (info[5].IsString()) {
       input->httpHint = info[5].ToString().Utf8Value();
     }
+    input->bestEffort = info[6].ToBoolean();
 
     return input;
   }
@@ -79,13 +81,17 @@ namespace NodeCld {
     if (input->httpHint.length() > 0) {
       hints.content_language_hint = input->httpHint.c_str();
     }
+    int flags = 0;
+    if (input->bestEffort) {
+      flags |= CLD2::kCLDFlagBestEffort;
+    }
 
     CLD2::ExtDetectLanguageSummary(
       input->bytes.c_str(),
       input->numBytes,
       input->isPlainText,
       &hints,
-      0,
+      flags,
       output->language3,
       output->percent3,
       output->normalized_score3,