diff --git a/include/etl/integral_limits.h b/include/etl/integral_limits.h
index f7b7c68c..8ac9aa80 100644
--- a/include/etl/integral_limits.h
+++ b/include/etl/integral_limits.h
@@ -459,6 +459,54 @@ namespace etl
     template <typename T>
     ETL_CONSTANT bool statics_char32_t<T>::is_signed;
 #endif
+
+#if ETL_USING_20BIT_TYPES
+template <typename T = void>
+    struct statics___int20
+    {
+      typedef __int20 value_type;
+
+      static ETL_CONSTANT __int20 min       = 0x80000;
+      static ETL_CONSTANT __int20 max       = 0x7FFFF;
+      static ETL_CONSTANT int     bits      = 20;
+      static ETL_CONSTANT bool    is_signed = true;
+    };
+
+    template <typename T>
+    ETL_CONSTANT __int20 statics___int20<T>::min;
+
+    template <typename T>
+    ETL_CONSTANT __int20 statics___int20<T>::max;
+
+    template <typename T>
+    ETL_CONSTANT int statics___int20<T>::bits;
+
+    template <typename T>
+    ETL_CONSTANT bool statics___int20<T>::is_signed;
+
+    template <typename T = void>
+    struct statics_unsigned___int20
+    {
+      typedef unsigned __int20 value_type;
+
+      static ETL_CONSTANT unsigned __int20 min       = 0;
+      static ETL_CONSTANT unsigned __int20 max       = 0xFFFFF;
+      static ETL_CONSTANT int              bits      = 20;
+      static ETL_CONSTANT bool             is_signed = false;
+    };
+
+    template <typename T>
+    ETL_CONSTANT unsigned __int20 statics_unsigned___int20<T>::min;
+
+    template <typename T>
+    ETL_CONSTANT unsigned __int20 statics_unsigned___int20<T>::max;
+
+    template <typename T>
+    ETL_CONSTANT int statics_unsigned___int20<T>::bits;
+
+    template <typename T>
+    ETL_CONSTANT bool statics_unsigned___int20<T>::is_signed;
+#endif
   }
 
   //***************************************************************************
@@ -556,6 +604,21 @@ namespace etl
   struct integral_limits<unsigned long long> : public private_integral_limits::statics_unsigned_long_long<>
   {
   };
+
+  #if ETL_USING_20BIT_TYPES
+  //***************************************************************************
+  ///\ingroup integral_limits
+  //***************************************************************************
+  template <>
+  struct integral_limits<__int20> : public private_integral_limits::statics___int20<>
+  {
+  };
+
+  template <>
+  struct integral_limits<unsigned __int20> : public private_integral_limits::statics_unsigned___int20<>
+  {
+  };
+  #endif
 }
 
 #include "private/minmax_pop.h"
diff --git a/include/etl/platform.h b/include/etl/platform.h
index b4f0d67a..303e8ccb 100644
--- a/include/etl/platform.h
+++ b/include/etl/platform.h
@@ -117,6 +117,17 @@ SOFTWARE.
 
 #define ETL_8BIT_SUPPORT (CHAR_BIT == 8) // Deprecated
 
+//*************************************
+// Some targets support 20bit types.
+#if defined(ETL_USE_20BIT_TYPES)
+  #define ETL_USING_20BIT_TYPES     1
+  #define ETL_NOT_USING_20BIT_TYPES 0
+#else
+  #define ETL_USING_20BIT_TYPES     0
+  #define ETL_NOT_USING_20BIT_TYPES 1
+#endif
+
+
 //*************************************
 // Helper macro for ETL_NO_64BIT_TYPES.
 #if defined(ETL_NO_64BIT_TYPES)
diff --git a/support/Release notes.txt b/support/Release notes.txt
index e63f15a7..b303b821 100644
--- a/support/Release notes.txt	
+++ b/support/Release notes.txt	
@@ -2,6 +2,7 @@
 20.39.0
 
 Refactored:
+Breaking change.
 Modified io_port classes so that they are not derived from iterator types.
     Added iterator and const_iterator types.
     Added iter() and citer() member functions to get an iterator.
@@ -10,8 +11,9 @@ Modified io_port classes so that they are not derived from iterator types.
 
 Fixes:
 #921 unique_ptr reset
-#923 Missing equality operator for class expected
+#923 Missing equality operator for class expected 
 #930 Unused parameter warnings
+#931 Using etl::make_vector to make a vector of two pairs causes a compile error
 
 Features:
 #918 Request for additional operator support for etl::io_port_*
@@ -27,7 +29,10 @@ Pull Requests
 #927 Fix missing partial specialisation equal operators
 #928 Add missing swap implementations for expected
 #929 Fix run-tests.sh script
+#932 Fix issue #931 Using etl::make_vector to make a vector of two pairs causes a compile error
 #934 Fixes compiler detection with Wundef
+#935 Added 20 bit integral limits (MSP430 devices)
+     New configuration macro, ETL_USE_20BIT_TYPES, which controls the definition of ETL_USING_20BIT_TYPES and ETL_NOT_USING_20BIT_TYPES.
 
 ===============================================================================
 20.38.17