diff --git a/include/xo/expression2/DUniqueString.hpp b/include/xo/expression2/DUniqueString.hpp
index 4d7dc0fd..46fdfa1e 100644
--- a/include/xo/expression2/DUniqueString.hpp
+++ b/include/xo/expression2/DUniqueString.hpp
@@ -28,6 +28,7 @@ namespace xo {
             using AAllocator = xo::mm::AAllocator;
             using ACollector = xo::mm::ACollector;
             using size_type = DString::size_type;
+            using ppindentinfo = xo::print::ppindentinfo;
 
             /* Memory model for a DUniqueString allocated via xo allocator
              *
@@ -74,6 +75,12 @@ namespace xo {
             std::size_t hash() const noexcept { return _text()->hash(); }
             operator std::string_view() const noexcept { return std::string_view(*_text()); }
 
+            ///@}
+            /** @defgroup duniquestring-printable-methods printable facet methods **/
+            ///@{
+
+            bool pretty(const ppindentinfo & ppii) const;
+
             ///@}
             /** @defgroup duniquestring-gcobject-methods gcobject facet methods **/
             ///@{
diff --git a/src/expression2/DUniqueString.cpp b/src/expression2/DUniqueString.cpp
index 3e534b9c..d0a4b0a0 100644
--- a/src/expression2/DUniqueString.cpp
+++ b/src/expression2/DUniqueString.cpp
@@ -33,6 +33,12 @@ namespace xo {
             return (const DString *)(((std::byte *)this) + offset);
         }
 
+        bool
+        DUniqueString::pretty(const ppindentinfo & ppii) const
+        {
+            return _text()->pretty(ppii);
+        }
+
         DUniqueString *
         DUniqueString::from_view(obj<AAllocator> mm,
                                  std::string_view sv)