update docs/ContribOperators.md

docs/ContribOperators.md

@@ -1596,6 +1596,8 @@ This version of the operator has been available since version 1 of the 'com.micr
 <dd>(Optional) Hardware architecture.</dd>
 <dt><tt>main_context</tt> : int</dt>
 <dd>Usually each single EPContext associate with a graph partition.But for some case like QNN, it has single EPContext contains all partitions.In that case, the node with ep_cache_context should set main_context=1. Other nodes set main_context=0 and skip ep_cache_context.The path is relative to this Onnx file. Default is 1.</dd>
+<dt><tt>max_size</tt> : int</dt>
+<dd>max size in the context. Usage depend on the EP.</dd>
 <dt><tt>notes</tt> : string</dt>
 <dd>(Optional) Some notes for the model</dd>
 <dt><tt>onnx_model_filename</tt> : string</dt>