diff --git a/ch04.asciidoc b/ch04.asciidoc
index 9416f070..4d88aa81 100644
--- a/ch04.asciidoc
+++ b/ch04.asciidoc
@@ -547,7 +547,7 @@ In our first chapter, we introduced Eugenio, a children's charity director opera
 
 ===== Generating Vanity Addresses
 
-It's important to realize that a bitcoin address is simply a number represented by symbols in the Base-58 alphabet. The search for a pattern like "1Kids" can be seen as searching for an address in the range from "1Kids11111111111111111111111111111" to "1Kidszzzzzzzzzzzzzzzzzzzzzzzzzzzzz". There are approximately 58^31^ (approximately 4.6 * 10^54^) addresses in that range, all starting with "1Kids". 
+It's important to realize that a bitcoin address is simply a number represented by symbols in the Base-58 alphabet. The search for a pattern like "1Kids" can be seen as searching for an address in the range from "1Kids11111111111111111111111111111" to "1Kidszzzzzzzzzzzzzzzzzzzzzzzzzzzzz". There are approximately 58^29^ (approximately 1.4 * 10^51^) addresses in that range, all starting with "1Kids". 
 
 .The range of vanity addresses starting with "1Kids"
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