diff --git a/readme.md b/readme.md
index 4f9f388..5fbceb5 100644
--- a/readme.md
+++ b/readme.md
@@ -7,6 +7,21 @@ A [Flipper Zero](https://flipperzero.one/) application (aka "fap") to interface
 
 File issues in [GitHub](https://github.com/bettse/seader/issues).
 
+
+## Formats
+
+Seader can save from the Source(top) formats to the Destination(left) formats.
+
+| | Seos | Desfire Ev2 | Desfire Ev1 | MFC SE | MFC (legacy) | iClass SE | iClass SR | iClass (legacy) |
+| ----------- | ---- | ----------- | ----------- | ------ | ------------ | --------- | --------- | --------------- |
+| Seader (no SIO) | x | x | x | x | x | x | x | x |
+| LFRFID | x | x | x | x | x | x | x | x |
+| iClass (legacy) | X | x | x | X | X | x | x | X |
+| MFC (legacy) | X | x | x | X | X | x | x | X |
+| Seader (with SIO) | | x | x | | | x | x | |
+| iClass SR | | x | x | | | x | x | |
+
+
 ## Hardware
 
 ### Option 1: NARD flipper add-on
@@ -58,3 +73,5 @@ Optionally 3d print a [case designed by sean](https://www.printables.com/model/5
 - `arm-none-eabi-nm ~/.ufbt/build/seader.fap -CS --size-sort`
 - `arm-none-eabi-readelf ~/.ufbt/build/seader.fap -t`
 - `ufbt cli` -> `free_blocks`
+
+