diff --git a/verilog/rtl/defines.v b/verilog/rtl/defines.v
index 8c96402..f5a6c90 100644
--- a/verilog/rtl/defines.v
+++ b/verilog/rtl/defines.v
@@ -7,8 +7,10 @@
 
 // Type and size of soc_mem
 // `define USE_OPENRAM
+// `define USE_CUSTOM_DFFRAM
+// don't change the following without double checking addr widths
 `define MEM_WORDS 256
 
 // Number of RAM blocks for the mgmt_core
 `define MGMT_BLOCKS 2
-`define USER_BLOCKS 6
\ No newline at end of file
+`define USER_BLOCKS 6