diff --git a/Samples/2_Concepts_and_Techniques/boxFilter/boxFilter_cpu.cpp b/Samples/2_Concepts_and_Techniques/boxFilter/boxFilter_cpu.cpp
index 765cc849..0d9c3d9b 100644
--- a/Samples/2_Concepts_and_Techniques/boxFilter/boxFilter_cpu.cpp
+++ b/Samples/2_Concepts_and_Techniques/boxFilter/boxFilter_cpu.cpp
@@ -74,7 +74,7 @@ void hboxfilter_y(float *id, float *od, int w, int h, int r) {
 
   for (int x = 0; x < w; x++) {
     float t;
-    // do left edge
+    // do top edge
     t = id[x] * r;
 
     for (int y = 0; y < r + 1; y++) {
@@ -98,7 +98,7 @@ void hboxfilter_y(float *id, float *od, int w, int h, int r) {
       od[c] = t * scale;
     }
 
-    // do right edge
+    // do bottom edge
     for (int y = h - r; y < h; y++) {
       int c = y * w + x;
       t += id[(h - 1) * w + x];
diff --git a/Samples/2_Concepts_and_Techniques/boxFilter/boxFilter_kernel.cu b/Samples/2_Concepts_and_Techniques/boxFilter/boxFilter_kernel.cu
index 1f57bef6..f1237316 100644
--- a/Samples/2_Concepts_and_Techniques/boxFilter/boxFilter_kernel.cu
+++ b/Samples/2_Concepts_and_Techniques/boxFilter/boxFilter_kernel.cu
@@ -129,7 +129,7 @@ __device__ void d_boxfilter_y(float *id, float *od, int w, int h, int r) {
   float scale = 1.0f / (float)((r << 1) + 1);
 
   float t;
-  // do left edge
+  // do top edge
   t = id[0] * r;
 
   for (int y = 0; y < (r + 1); y++) {
@@ -151,7 +151,7 @@ __device__ void d_boxfilter_y(float *id, float *od, int w, int h, int r) {
     od[y * w] = t * scale;
   }
 
-  // do right edge
+  // do bottom edge
   for (int y = h - r; y < h; y++) {
     t += id[(h - 1) * w];
     t -= id[((y - r) * w) - w];
@@ -271,7 +271,7 @@ __global__ void d_boxfilter_rgba_y(unsigned int *id, unsigned int *od, int w,
   float scale = 1.0f / (float)((r << 1) + 1);
 
   float4 t;
-  // do left edge
+  // do top edge
   t = rgbaIntToFloat(id[0]) * r;
 
   for (int y = 0; y < (r + 1); y++) {
@@ -293,7 +293,7 @@ __global__ void d_boxfilter_rgba_y(unsigned int *id, unsigned int *od, int w,
     od[y * w] = rgbaFloatToInt(t * scale);
   }
 
-  // do right edge
+  // do bottom edge
   for (int y = h - r; y < h; y++) {
     t += rgbaIntToFloat(id[(h - 1) * w]);
     t -= rgbaIntToFloat(id[((y - r) * w) - w]);