diff --git a/clang/README.txt b/clang/README.txt
index 2512b581e6f4..bce881f36dff 100644
--- a/clang/README.txt
+++ b/clang/README.txt
@@ -45,7 +45,6 @@ Lexer:
 Preprocessor:
  * Function-style #define & macro expansion
  * #line / #file directives
- * Detection of "atomic" headers: #if !defined.
  * -C output mode in -E mode.
 
 Traditional Preprocessor: