diff --git a/README.md b/README.md
index 0f68860..cebf872 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ Schala
 
 Schala is a Rust-language framework written to make it easy to
 create and experiment with toy programming languages. It provides
-a common REPL, and a typeclass `ProgrammingLanguage` with methods
+a common REPL, and a trait `ProgrammingLanguage` with methods
 for tokenizing text, parsing tokens, evaluating an abstract syntax tree,
 and other tasks that are common to all programming languages.