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-rw-r--r--doc/README.splashprepare5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/README.splashprepare b/doc/README.splashprepare
index a0f0f3ca51..56c1bef662 100644
--- a/doc/README.splashprepare
+++ b/doc/README.splashprepare
@@ -19,3 +19,8 @@ splashsource works as follows:
use that splash location.
- If splashsource is undefined, use the first splash location as default.
- If splashsource is set to an unsupported value, do not load a splash screen.
+
+A splash source location can describe either storage with raw data, or storage
+formatted with a file system. In case of a filesystem, the splash screen data is
+loaded as a file. The name of the splash screen file can be controlled with the
+environment variable "splashfile".
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