diff --git a/tools/binman/missing-blob-help b/tools/binman/missing-blob-help
index 551ca87..c61ca02 100644
--- a/tools/binman/missing-blob-help
+++ b/tools/binman/missing-blob-help
@@ -33,3 +33,7 @@
 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.
+
+tee-os:
+See the documentation for your board. You may need to build Open Portable
+Trusted Execution Environment (OP-TEE) with TEE=/path/to/tee.bin