diff --git a/src/security/validity-period.hpp b/src/security/validity-period.hpp
index ee7c602..ba05b7a 100644
--- a/src/security/validity-period.hpp
+++ b/src/security/validity-period.hpp
@@ -32,7 +32,7 @@
 
 
 /** @brief Abstraction of validity period
- *  @sa docs/tutorials/certificate-format.rst
+ *  @sa docs/specs/certificate-format.rst
  */
 class ValidityPeriod
 {