diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index 8421797..2401153 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -19775,7 +19775,7 @@ Architectural rule summary:
 
 * [A.1: Separate stable from less stable part of code](#Ra-stable)
 * [A.2: Express potentially reusable parts as a library](#Ra-lib)
-* [A.4: There should be no cycles among libraries](#?Ra-dag)
+* [A.4: There should be no cycles among libraries](#Ra-dag)
 * [???](#???)
 * [???](#???)
 * [???](#???)