diff --git a/tools/binman/missing-blob-help b/tools/binman/missing-blob-help
index f7bc80e..dc2d9c9 100644
--- a/tools/binman/missing-blob-help
+++ b/tools/binman/missing-blob-help
@@ -17,3 +17,8 @@
 scp-sunxi:
 SCP firmware is required for system suspend, but is otherwise optional.
 Please read the section on SCP firmware in board/sunxi/README.sunxi64
+
+k3-rti-wdt-firmware:
+If CONFIG_WDT_K3_RTI_LOAD_FW is enabled, a firmware image is needed for
+the R5F core(s) to trigger the system reset. One possible source is
+https://github.com/siemens/k3-rti-wdt.