diff --git a/ch04.asciidoc b/ch04.asciidoc
index f45fc94c..0681c163 100644
--- a/ch04.asciidoc
+++ b/ch04.asciidoc
@@ -40,7 +40,7 @@ A +private key+ is simply a number, picked at random. Ownership and control over
 
 ===== Generating a private key from a random number
 
-A private key is a number between +1+ and +n - 1+, where n is a constant defined in the elliptic curve standard (latexmath:[\(n = 1.158 * 10^\(77\) \)], n is the order of the elliptic curve used in bitcoin. See <<elliptic_curve>>). To create such a key, we randomly pick a 256-bit number and check that it is less than +n - 1+. In programming terms, this is usually achieved by feeding a larger string of random bits, collected from a cryptographically-secure source of randomness, into the SHA-256 hash algorithm which will conveniently produce a 256-bit number. If the result is less than +n - 1+, we have a suitable private key. If it is greater than +n - 1+, we simply try again with another random number. 
+A private key is a number between +1+ and +n - 1+, where n is a constant defined in the elliptic curve standard (latexmath:[\(n = 1.158 * 10^\(77\) \)], n is the order of the elliptic curve used in bitcoin. See <<elliptic_curve>>). To create such a key, we randomly pick a 256-bit number and check that it is less than +n - 1+. In programming terms, this is usually achieved by feeding a larger string of random bits, collected from a cryptographically-secure source of randomness, into the SHA-256 hash algorithm which will conveniently produce a 256-bit number. If the result is less than +n - 1+, we have a suitable private key. Otherwise, we simply try again with another random number. 
 	
 [TIP]
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