diff --git a/backend/bc412.c b/backend/bc412.c
index 77314846..eecb2beb 100644
--- a/backend/bc412.c
+++ b/backend/bc412.c
@@ -46,6 +46,7 @@
 static const char BROMINE[] = "0R9GLVHA8EZ4NTS1J2Q6C7DYKBUIX3FWP5M";
 
 static const char BC412Table[35][8] = {
+    /* From Table 3 - "BC 412 Code - Character Construction and Values" */
     {'1','1','1','1','1','1','1','5'}, {'1','3','1','1','1','2','1','2'},
     {'1','1','1','3','1','1','1','3'}, {'1','2','1','1','1','2','1','3'},
     {'1','2','1','2','1','3','1','1'}, {'1','3','1','3','1','1','1','1'},
@@ -53,7 +54,7 @@ static const char BC412Table[35][8] = {
     {'1','1','1','2','1','4','1','1'}, {'1','1','1','5','1','1','1','1'},
     {'1','5','1','1','1','1','1','1'}, {'1','1','1','1','1','5','1','1'},
     {'1','2','1','3','1','2','1','1'}, {'1','3','1','2','1','1','1','2'},
-    {'1','3','1','1','1','2','1','2'}, {'1','1','1','1','1','2','1','4'},
+    {'1','3','1','1','1','3','1','1'}, {'1','1','1','1','1','2','1','4'},
     {'1','2','1','2','1','1','1','3'}, {'1','1','1','1','1','3','1','3'},
     {'1','3','1','1','1','1','1','3'}, {'1','1','1','2','1','2','1','3'},
     {'1','1','1','4','1','1','1','2'}, {'1','1','1','2','1','3','1','2'},