diff --git a/ostd/limits.hh b/ostd/limits.hh
index f11481b..cdf148f 100644
--- a/ostd/limits.hh
+++ b/ostd/limits.hh
@@ -84,19 +84,19 @@ namespace detail {
 }
 
 template<typename T>
-static constexpr T NumericLimitMin = detail::NumericLimitsBase<T>::minv;
+constexpr T NumericLimitMin = detail::NumericLimitsBase<T>::minv;
 
 template<typename T>
-static constexpr T NumericLimitMax = detail::NumericLimitsBase<T>::maxv;
+constexpr T NumericLimitMax = detail::NumericLimitsBase<T>::maxv;
 
 template<typename T>
-static constexpr T NumericLimitLowest = detail::NumericLimitsBase<T>::lowv;
+constexpr T NumericLimitLowest = detail::NumericLimitsBase<T>::lowv;
 
 template<typename T>
-static constexpr bool NumericLimitIsSigned = detail::NumericLimitsBase<T>::is_signed;
+constexpr bool NumericLimitIsSigned = detail::NumericLimitsBase<T>::is_signed;
 
 template<typename T>
-static constexpr bool NumericLimitIsInteger = detail::NumericLimitsBase<T>::is_integer;
+constexpr bool NumericLimitIsInteger = detail::NumericLimitsBase<T>::is_integer;
 
 }
 
diff --git a/ostd/type_traits.hh b/ostd/type_traits.hh
index 34d135c..4623b8a 100644
--- a/ostd/type_traits.hh
+++ b/ostd/type_traits.hh
@@ -7,6 +7,7 @@
 #ifndef OSTD_TYPE_TRAITS_HH
 #define OSTD_TYPE_TRAITS_HH
 
+#include <limits.h>
 #include <stddef.h>
 
 #include "ostd/types.hh"
@@ -55,6 +56,11 @@ namespace detail {
     AddRvalueReference<T> declval_in() noexcept;
 }
 
+/* size in bits */
+
+template<typename T>
+constexpr Size SizeInBits = sizeof(T) * CHAR_BIT;
+
 /* integral constant */
 
 template<typename T, T val>