diff --git a/examples/faceBlendCoefficients.js b/examples/faceBlendCoefficients.js
index 56fcadca9d..6756be548f 100644
--- a/examples/faceBlendCoefficients.js
+++ b/examples/faceBlendCoefficients.js
@@ -1,10 +1,10 @@
 //
-//  coefficients.js
+//  faceBlendCoefficients.js
 //
 //  version 2.0
 //
 //  Created by Bob Long, 9/14/2015
-//  A simple panel that can display the blending coefficients of Avatar's face model.
+//  A simple panel that can select and display the blending coefficient of the Avatar's face model.
 //  
 //  Distributed under the Apache License, Version 2.0.
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
diff --git a/libraries/render-utils/src/Model.h b/libraries/render-utils/src/Model.h
index d1aa2901c8..e8f158be08 100644
--- a/libraries/render-utils/src/Model.h
+++ b/libraries/render-utils/src/Model.h
@@ -192,9 +192,9 @@ public:
     void setCauterizeBoneSet(const std::unordered_set<int>& boneSet) { _cauterizeBoneSet = boneSet; }
 
     int getBlendshapeCoefficientsNum() const { return _blendshapeCoefficients.size(); }
-    float getBlendshapeCoefficient(int index) const {
-        return index >= _blendshapeCoefficients.size() || index < 0 ?
-               0.0f : _blendshapeCoefficients.at(index); }
+    float getBlendshapeCoefficient(unsigned int index) const {
+        return index >= _blendshapeCoefficients.size() ? 0.0f : _blendshapeCoefficients.at(index);
+     }
 
 protected: