diff --git a/modules/dnn/include/opencv2/dnn/dnn.hpp b/modules/dnn/include/opencv2/dnn/dnn.hpp
index 3ee75cb28..16cacb85e 100644
--- a/modules/dnn/include/opencv2/dnn/dnn.hpp
+++ b/modules/dnn/include/opencv2/dnn/dnn.hpp
@@ -49,13 +49,14 @@ namespace dnn
         ~Net();
 
         int addLayer(const String &name, const String &type, LayerParams &params);
-        int getLayerId(LayerId layer);
-        void deleteLayer(LayerId layer);
+        int addLayerToPrev(const String &name, const String &type, LayerParams &params);
 
-        void setNetInputs(const std::vector<String> &inputBlobNames);
+        int getLayerId(const String &layer);
+        void deleteLayer(LayerId layer);
 
         void connect(String outPin, String inpPin);
         void connect(int outLayerId, int outNum, int inLayerId, int inNum);
+        void setNetInputs(const std::vector<String> &inputBlobNames);
 
         void forward();
         void forward(LayerId toLayer);
diff --git a/modules/dnn/src/dnn.cpp b/modules/dnn/src/dnn.cpp
index 472455a8c..714643a50 100644
--- a/modules/dnn/src/dnn.cpp
+++ b/modules/dnn/src/dnn.cpp
@@ -383,7 +383,7 @@ int Net::addLayer(const String &name, const String &type, LayerParams &params)
 {
     if (name.find('.') != String::npos)
     {
-        CV_Error(Error::StsBadArg, "Added layer name \"" + name + "\" should not contain dot symbol");
+        CV_Error(Error::StsBadArg, "Added layer name \"" + name + "\" must not contain dot symbol");
         return -1;
     }
 
@@ -400,6 +400,14 @@ int Net::addLayer(const String &name, const String &type, LayerParams &params)
     return id;
 }
 
+int Net::addLayerToPrev(const String &name, const String &type, LayerParams &params)
+{
+    int prvLid = impl->lastLayerId;
+    int newLid = this->addLayer(name, type, params);
+    this->connect(prvLid, 0, newLid, 0);
+    return newLid;
+}
+
 void Net::connect(int outLayerId, int outNum, int inLayerId, int inNum)
 {
     impl->connect(outLayerId, outNum, inLayerId, inNum);
@@ -467,6 +475,18 @@ Blob Net::getParam(LayerId layer, int numParam)
     return layerBlobs[numParam];
 }
 
+int Net::getLayerId(const String &layer)
+{
+    return impl->getLayerId(layer);
+}
+
+void Net::deleteLayer(LayerId)
+{
+    CV_Error(Error::StsNotImplemented, "");
+}
+
+//////////////////////////////////////////////////////////////////////////
+
 Importer::~Importer()
 {
 
@@ -530,16 +550,5 @@ Ptr<Layer> LayerRegister::createLayerInstance(const String &_type, LayerParams&
     }
 }
 
-int Net::getLayerId(LayerId)
-{
-    CV_Error(Error::StsNotImplemented, "");
-    return -1;
-}
-
-void Net::deleteLayer(LayerId)
-{
-    CV_Error(Error::StsNotImplemented, "");
-}
-
 }
 }
diff --git a/modules/dnn/src/layers/im2col.cpp b/modules/dnn/src/layers/im2col.cpp
index 6a400bd9c..a4a7ceca8 100644
--- a/modules/dnn/src/layers/im2col.cpp
+++ b/modules/dnn/src/layers/im2col.cpp
@@ -9,10 +9,10 @@ namespace dnn
 {
 
 void im2col_ocl(UMat &img,
-                int channels, int height, int width, 
+                int channels, int height, int width,
                 int kernel_h, int kernel_w,
                 int pad_h, int pad_w,
-                int stride_h, int stride_w, 
+                int stride_h, int stride_w,
                 UMat &col)
 {
     int h_out = (height + 2 * pad_h - kernel_h) / stride_h + 1;
diff --git a/modules/dnn/src/layers/im2col.hpp b/modules/dnn/src/layers/im2col.hpp
index b82ef706e..93d09a757 100644
--- a/modules/dnn/src/layers/im2col.hpp
+++ b/modules/dnn/src/layers/im2col.hpp
@@ -7,8 +7,8 @@ namespace dnn
 {
 
 template <typename Dtype>
-void im2col_cpu(const Dtype* data_im, 
-                int channels, int height, int width, 
+void im2col_cpu(const Dtype* data_im,
+                int channels, int height, int width,
                 int kernel_h, int kernel_w,
                 int pad_h, int pad_w,
                 int stride_h, int stride_w,
@@ -36,7 +36,7 @@ void im2col_cpu(const Dtype* data_im,
 }
 
 template <typename Dtype>
-void col2im_cpu(const Dtype* data_col, 
+void col2im_cpu(const Dtype* data_col,
                 int channels, int height, int width,
                 int patch_h, int patch_w,
                 int pad_h, int pad_w,