diff --git a/doc/source/firmware/backup-ram.rst b/doc/source/firmware/backup-ram.rst
index 0e36c32..4d0d9f2 100644
--- a/doc/source/firmware/backup-ram.rst
+++ b/doc/source/firmware/backup-ram.rst
@@ -62,6 +62,8 @@ The flags are stored in memory using the follwoing structure:
 
 .. doxygenstruct:: safety_memory_boot_status
 
+Flags are evaluated active, if the corresponding word is unequal to ``0``.
+
 Config Overrides
 ~~~~~~~~~~~~~~~~