diff --git a/samples/directx/d3d10_interop.cpp b/samples/directx/d3d10_interop.cpp
index 99defa256c..b2849cb1ce 100644
--- a/samples/directx/d3d10_interop.cpp
+++ b/samples/directx/d3d10_interop.cpp
@@ -16,6 +16,14 @@
 using namespace std;
 using namespace cv;
 
+/*
+// Sample demonstrating interoperability of OpenCV UMat with Direct X surface
+// At first, the data obtained from video file or camera and
+// placed onto Direct X surface,
+// following mapping of this Direct X surface to OpenCV UMat and call cv::Blur
+// function. The result is mapped back to Direct X surface and rendered through
+// Direct X API.
+*/
 class D3D10WinApp : public D3DSample
 {
 public:
diff --git a/samples/directx/d3d11_interop.cpp b/samples/directx/d3d11_interop.cpp
index 02b576bbe7..eb21c99814 100644
--- a/samples/directx/d3d11_interop.cpp
+++ b/samples/directx/d3d11_interop.cpp
@@ -16,6 +16,14 @@
 using namespace std;
 using namespace cv;
 
+/*
+// Sample demonstrating interoperability of OpenCV UMat with Direct X surface
+// At first, the data obtained from video file or camera and
+// placed onto Direct X surface,
+// following mapping of this Direct X surface to OpenCV UMat and call cv::Blur
+// function. The result is mapped back to Direct X surface and rendered through
+// Direct X API.
+*/
 class D3D11WinApp : public D3DSample
 {
 public:
diff --git a/samples/directx/d3d9_interop.cpp b/samples/directx/d3d9_interop.cpp
index 61a916c1e5..aca0245154 100644
--- a/samples/directx/d3d9_interop.cpp
+++ b/samples/directx/d3d9_interop.cpp
@@ -16,6 +16,14 @@
 using namespace std;
 using namespace cv;
 
+/*
+// Sample demonstrating interoperability of OpenCV UMat with Direct X surface
+// At first, the data obtained from video file or camera and
+// placed onto Direct X surface,
+// following mapping of this Direct X surface to OpenCV UMat and call cv::Blur
+// function. The result is mapped back to Direct X surface and rendered through
+// Direct X API.
+*/
 class D3D9WinApp : public D3DSample
 {
 public:
diff --git a/samples/directx/d3d9ex_interop.cpp b/samples/directx/d3d9ex_interop.cpp
index 3d133a6b47..7ca405b164 100644
--- a/samples/directx/d3d9ex_interop.cpp
+++ b/samples/directx/d3d9ex_interop.cpp
@@ -16,6 +16,14 @@
 using namespace std;
 using namespace cv;
 
+/*
+// Sample demonstrating interoperability of OpenCV UMat with Direct X surface
+// At first, the data obtained from video file or camera and
+// placed onto Direct X surface,
+// following mapping of this Direct X surface to OpenCV UMat and call cv::Blur
+// function. The result is mapped back to Direct X surface and rendered through
+// Direct X API.
+*/
 class D3D9ExWinApp : public D3DSample
 {
 public: