diff --git a/docs/users_guide/framework_basics/design_overview.md b/docs/users_guide/framework_basics/design_overview.md
index ce7f4441..da38cd95 100644
--- a/docs/users_guide/framework_basics/design_overview.md
+++ b/docs/users_guide/framework_basics/design_overview.md
@@ -231,8 +231,8 @@ For example:
 A unit can be defined by the user in one of the following ways:
 
 ```cpp
-template<PrefixableUnit auto U> struct kilo_ : prefixed_unit<"k", mag_power<10, 3>, U> {};
-template<PrefixableUnit auto U> inline constexpr kilo_<U> kilo;
+template<PrefixableUnit U> struct kilo_ : prefixed_unit<"k", mag_power<10, 3>, U{}> {};
+template<PrefixableUnit auto U> inline constexpr kilo_<decltype(U)> kilo;
 
 inline constexpr struct second : named_unit<"s", kind_of<isq::time>> {} second;
 inline constexpr struct minute : named_unit<"min", mag<60> * second> {} minute;
diff --git a/docs/users_guide/framework_basics/systems_of_units.md b/docs/users_guide/framework_basics/systems_of_units.md
index 8f341023..3d263c11 100644
--- a/docs/users_guide/framework_basics/systems_of_units.md
+++ b/docs/users_guide/framework_basics/systems_of_units.md
@@ -137,8 +137,8 @@ unit magnitude in a more flexible way.
 Each prefix is implemented similarly to the following:
 
 ```cpp
-template<PrefixableUnit auto U> struct quecto_ : prefixed_unit<"q", mag_power<10, -30>, U> {};
-template<PrefixableUnit auto U> inline constexpr quecto_<U> quecto;
+template<PrefixableUnit U> struct quecto_ : prefixed_unit<"q", mag_power<10, -30>, U{}> {};
+template<PrefixableUnit auto U> inline constexpr quecto_<decltype(U)> quecto;
 ```
 
 and then a [PrefixableUnit](concepts.md#PrefixableUnit) can be prefixed in the following
@@ -153,8 +153,8 @@ efficiently represent any rational magnitude. For example, IEC 80000 prefixes us
 IT industry can be implemented as:
 
 ```cpp
-template<PrefixableUnit auto U> struct yobi_ : prefixed_unit<"Yi", mag_power<2, 80>, U> {};
-template<PrefixableUnit auto U> inline constexpr yobi_<U> yobi;
+template<PrefixableUnit U> struct yobi_ : prefixed_unit<"Yi", mag_power<2, 80>, U{}> {};
+template<PrefixableUnit auto U> inline constexpr yobi_<decltype(U)> yobi;
 ```
 
 ## Scaled units
diff --git a/docs/users_guide/framework_basics/text_output.md b/docs/users_guide/framework_basics/text_output.md
index 4b21b482..de8c96ea 100644
--- a/docs/users_guide/framework_basics/text_output.md
+++ b/docs/users_guide/framework_basics/text_output.md
@@ -62,14 +62,14 @@ and units of derived quantities.
 === "Prefixes"
 
     ```cpp
-    template<PrefixableUnit auto U> struct micro_ : prefixed_unit<{u8"µ", "u"}, mag_power<10, -6>, U> {};
-    template<PrefixableUnit auto U> struct milli_ : prefixed_unit<"m", mag_power<10, -3>, U> {};
-    template<PrefixableUnit auto U> struct centi_ : prefixed_unit<"c", mag_power<10, -2>, U> {};
-    template<PrefixableUnit auto U> struct deci_  : prefixed_unit<"d", mag_power<10, -1>, U> {};
-    template<PrefixableUnit auto U> struct deca_  : prefixed_unit<"da", mag_power<10, 1>, U> {};
-    template<PrefixableUnit auto U> struct hecto_ : prefixed_unit<"h", mag_power<10, 2>, U> {};
-    template<PrefixableUnit auto U> struct kilo_  : prefixed_unit<"k", mag_power<10, 3>, U> {};
-    template<PrefixableUnit auto U> struct mega_  : prefixed_unit<"M", mag_power<10, 6>, U> {};
+    template<PrefixableUnit U> struct micro_ : prefixed_unit<{u8"µ", "u"}, mag_power<10, -6>, U{}> {};
+    template<PrefixableUnit U> struct milli_ : prefixed_unit<"m", mag_power<10, -3>, U{}> {};
+    template<PrefixableUnit U> struct centi_ : prefixed_unit<"c", mag_power<10, -2>, U{}> {};
+    template<PrefixableUnit U> struct deci_  : prefixed_unit<"d", mag_power<10, -1>, U{}> {};
+    template<PrefixableUnit U> struct deca_  : prefixed_unit<"da", mag_power<10, 1>, U{}> {};
+    template<PrefixableUnit U> struct hecto_ : prefixed_unit<"h", mag_power<10, 2>, U{}> {};
+    template<PrefixableUnit U> struct kilo_  : prefixed_unit<"k", mag_power<10, 3>, U{}> {};
+    template<PrefixableUnit U> struct mega_  : prefixed_unit<"M", mag_power<10, 6>, U{}> {};
     ```
 
 === "Constants"