diff --git a/docs/Build-Deploy-System.md b/docs/Build-Deploy-System.md
index 9f5aaa6d..7a2ab47a 100644
--- a/docs/Build-Deploy-System.md
+++ b/docs/Build-Deploy-System.md
@@ -15,6 +15,7 @@ all resources should be embedded using dotnet embedded resources to allow "singl
 
 - set github_token in your env (used by "ReleaseGithub" target)
 - tag automatically created by github (given RELEASE_NOTES.MD)
+- what happens if tag exists, what happens if release does not exist but the tag - this should be found somewhere here: https://docs.github.com/en/rest/reference/repos#releases
 
 # Title bar
 
@@ -22,4 +23,4 @@ all resources should be embedded using dotnet embedded resources to allow "singl
 
 # Known problems
 
-sometimes publish fails with ```Could not open file for writing (binary mode): F:\pro3d\openPro3d\src\PRo3D.Core\obj\Any CPU\Release\netcoreapp3.1\win10-x64\PRo3D.Core.dll``` on my machine. either dotnet problem or with my (often rather full) disk?
\ No newline at end of file
+sometimes publish fails with ```Could not open file for writing (binary mode): F:\pro3d\openPro3d\src\PRo3D.Core\obj\Any CPU\Release\netcoreapp3.1\win10-x64\PRo3D.Core.dll``` on my machine. either dotnet problem or with my (often rather full) disk?