diff --git a/ch05.asciidoc b/ch05.asciidoc
index bcbf1899..14a3fb68 100644
--- a/ch05.asciidoc
+++ b/ch05.asciidoc
@@ -325,7 +325,7 @@ The chain code (c) is used to introduce entropy in the function that creates chi
 
 The child key derivation functions are based on a one-way hash function that combines:
 
-* A parent private or public key (ECDSA uncompressed key)
+* A parent private or public key (ECDSA compressed key)
 * A seed called a chain code (256 bits)
 * An index number (32 bits)