diff --git a/ch04_keys.adoc b/ch04_keys.adoc
index be604b31..3afb4186 100644
--- a/ch04_keys.adoc
+++ b/ch04_keys.adoc
@@ -178,7 +178,7 @@ image::images/mbc3_0402.png["ecc-curve"]
 Bitcoin uses a specific elliptic curve and set of mathematical
 constants, as defined in a standard called +secp256k1+, established by
 the National Institute of Standards and Technology (NIST). The
-+secp256k1+ curve is defined by the following function, which produces
++secp256k1+ curve is defined by the following equation, which produces
 an elliptic curve:
 
 [latexmath]
diff --git a/meta/github_contrib.adoc b/meta/github_contrib.adoc
index 6bb33810..edaad114 100644
--- a/meta/github_contrib.adoc
+++ b/meta/github_contrib.adoc
@@ -189,6 +189,7 @@
 <li>yurigeorgiev4</li>
 <li>Zheng Jia (zhengjia)</li>
 <li>Zhou Liang (zhouguoguo)</li>
+<li>Suyang Liu (LiuYusuf)</li>
 </ul>
 ++++