diff --git a/include/nlohmann/detail/json_custom_base_class.hpp b/include/nlohmann/detail/json_custom_base_class.hpp
index 688bf90bd..5dc839ff3 100644
--- a/include/nlohmann/detail/json_custom_base_class.hpp
+++ b/include/nlohmann/detail/json_custom_base_class.hpp
@@ -9,7 +9,7 @@ namespace detail
 /*!
 @brief Default base class of the @ref basic_json class.
 
-So that the correct implementation of the copy / move ctors / assign operators
+So that the correct implementations of the copy / move ctors / assign operators
 of @ref basic_json do not require complex case distinctions
 (no base class / custom base class used as customization point),
 @ref basic_json always has a base class.