diff --git a/0004-general-uri-scheme/data/rad-uri.abnf b/0004-general-uri-scheme/data/rad-uri.abnf
index 53b0da3..5beec6f 100644
--- a/0004-general-uri-scheme/data/rad-uri.abnf
+++ b/0004-general-uri-scheme/data/rad-uri.abnf
@@ -205,4 +205,10 @@ sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ; Base58 Bitcoin Alphabet
-base58btc = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
\ No newline at end of file
+base58btc = "1" / "2" / "3" / "4" / "5" / "6" / "7" / "8" / "9"
+          / "A" / "B" / "C" / "D" / "E" / "F" / "G" / "H" / "J"
+          / "K" / "L" / "M" / "N" / "P" / "Q" / "R" / "S" / "T"
+          / "U" / "V" / "W" / "X" / "Y" / "Z"
+          / "a" / "b" / "c" / "d" / "e" / "f" / "g" / "h" / "i"
+          / "j" / "k" / "m" / "n" / "o" / "p" / "q" / "r" / "s"
+          / "t" / "u" / "v" / "w" / "x" / "y" / "z"