diff --git a/fuzzers/019-clb-ndi1mux/README.md b/fuzzers/019-clb-ndi1mux/README.md
index b2c4e8a2..714a2148 100644
--- a/fuzzers/019-clb-ndi1mux/README.md
+++ b/fuzzers/019-clb-ndi1mux/README.md
@@ -1,4 +1,8 @@
 # clb-ndi1mux Fuzzer
 
-See minitest for DI notes
+## NDI1MUX
+
+Configures the NDI1MUX mux which provides the DI1 input on CLB RAM.
+
+Availible selections varies by A/B/C/D, see db for details.