Update Support.md

hpvm/projects/keras/docs/Support.md

-
 ## Supported Keras Operators 
 
 The Keras frontend supports `Sequential()` Keras models.
@@ -27,14 +26,28 @@ The list of supported operations is as follows:
 * Softmax operator should be the last operation in the CNN pipeline 
 * Softmax operation must be a separate operator (not specified as activation to another type of Keras operator). Example of what works:
 
-```
+```python
 Activation ("softmax")
 ```
 
 Example of what is NOT supported:
 
-```
+```python
 Dense(num_classes, activation="softmax")
 ```
 
+* For convolutions with stride > 1 `same` convolution is NOT supported. Explicitly add `ZeroPadding2D` layer before `Conv2D` or `DepthwiseConv2D` operators. Example of what does NOT work:
+
+```python
+Conv2D(num_filters, (3,3), strides = (2,2), padding = `same`)
+```
+
+Example of what works instead:
+
+```python
+ZeroPadding2D(padding=(1,1), data_format = `channels_first`) # only support NCHW
+Conv2D(num_filters, (3,3), strides = (2,2), padding = `valid`)
+```
+
+