diff --git a/firmware/hw_layer/mc33816/rusefi/readme.md b/firmware/hw_layer/mc33816/rusefi/readme.md
index eb7e189c67..aabfc0f629 100644
--- a/firmware/hw_layer/mc33816/rusefi/readme.md
+++ b/firmware/hw_layer/mc33816/rusefi/readme.md
@@ -1,2 +1,6 @@
-# MC33816 Default Project
-Completely default project as generated by MC33816 Dev Studio conveniently comes with default source code.
+
+Source code here is different from but is heavily inspired by MC33816 example as conveniently comes with MC33816 Dev Studio.
+
+* Hit 'Build' button in MC33816 Developer Studio to get assembly stuff in 'build' folder
+
+* TODO what happens next? how do we get from 'build' folder to mc33816_data.c file?
\ No newline at end of file
diff --git a/firmware/hw_layer/mc33816_memory_map.h b/firmware/hw_layer/mc33816_memory_map.h
index 4fa839a7b7..b1ddd8378e 100644
--- a/firmware/hw_layer/mc33816_memory_map.h
+++ b/firmware/hw_layer/mc33816_memory_map.h
@@ -1,5 +1,9 @@
+/**
+ * see mc33816/rusefi/readme.md
+*/
 
 typedef enum {
+    // see dram1.def values
     Iboost = 0,
     Ipeak = 1,
     Ihold = 2,
@@ -8,6 +12,7 @@ typedef enum {
     Tbypass = 5,
     Thold_off = 6,
     Thold_tot = 7,
+    // see dram2.def values, base 64 for channel 2
     Vboost_high = 64,
     Vboost_low = 65,
     Isense4_high = 66,