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+++ b/README.md
@@ -1,6 +1,10 @@
 # Ford APIM Sync 3/4 AsBuilt decoder tool
 ## Current state
 Latest "Stable" release version: [1.3](https://github.com/consp/apim-asbuilt-decode/releases)
+
+### Supported Sync systems
+This version is meant for Sync 3 (all 1.0 to 3.0 versions and 3.2/3.3/3.4) systems, some options for Sync 4 are present but this is a work in progress. Some settings for Sync 3 are the same as for Sync 2 but this is not supported and it's recommended to look around for more information. The settings for Sync 1 and 1.1 systems are different, do not assume compatability with those.
+
 ## Intro
 This repository is meant for users who want to edit their values of the AsBuilt data of the Ford Sync 3 APIM and do not have a tool which has all information built in. The data has been collected from code (extracting debug information from the QNX applications) and other peoples findings on fora.
 
@@ -8,6 +12,7 @@ Please note that some settings change quite a lot. Most radio and CGEA/C1MCA set
 
 As with all DIY tools: YMMV and you do everything at your own risk. Changing stuff might brick your APIM, you have been warned!
 
+
 ## Acknowledgements
 - F150Forum's Livinitup and F150chief for the Sync 3 ASBuild sheet and information about Sync 3.x which was not present in the source code (or at least not obvious).
 - F150Forum's Livinitup for the Sync 4 config sheet