diff --git a/virtualsmartcard/doc/api.rst b/virtualsmartcard/doc/api.rst
index 71f0071..41685d1 100644
--- a/virtualsmartcard/doc/api.rst
+++ b/virtualsmartcard/doc/api.rst
@@ -1,7 +1,22 @@
+.. |vpicc| replace:: :abbr:`vpicc (virtual smart card)`
+.. |vpcd| replace:: :abbr:`vpcd (virtual smart card reader)`
+
 *****************************
 Creating a virtual smart card
 *****************************
 
+============= ==================== ============= =============
+|vpcd|                             |vpicc|
+---------------------------------- ---------------------------
+Length        Command              Length        Response
+============= ==================== ============= =============
+``0x00 0x01`` ``0x00`` (Power Off)               (No Response)
+``0x00 0x01`` ``0x01`` (Power On)                (No Response)
+``0x00 0x01`` ``0x02`` (Reset)                   (No Response)
+``0x00 0x01`` ``0x04`` (Get ATR)   ``0xXX 0xXX`` (ATR)
+``0xXX 0xXX`` (APDU)               ``0xXX 0xXX`` (R-APDU)
+============= ==================== ============= =============
+
 .. toctree::
 
    api/virtualsmartcard