diff --git a/AUTHORS.md b/AUTHORS.md
index a928c982d..c387b220f 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -3,6 +3,7 @@
 - Bojan Konstantinovic
 - Branislav Marton
 - Branko Jaksic
+- Danilo Milenkovic
 - Esma Niksic
 - Filip Grujcic
 - Filip Jankovic
@@ -23,6 +24,7 @@
 - Nikola Novakovic
 - Stefan Djordjevic
 - Stefan Filipovic
+- Stevan Zecic
 - Strahinja Jacimovic
 - Tanja Kovacevic
 - Uros Cvetinovic
diff --git a/changelog/v2.13.0/changelog.md b/changelog/v2.13.0/changelog.md
index 4cf957d34..e5c0ee000 100644
--- a/changelog/v2.13.0/changelog.md
+++ b/changelog/v2.13.0/changelog.md
@@ -18,6 +18,9 @@
   + [Changes](#changes)
     + [Improvements](#improvements)
       + [mikroSDK](#mikrosdk)
+    + [New features](#new-features)
+      + [mikroSDK](#mikrosdk-1)
+      + [CORE](#core)
     + [NEW HARDWARE](#new-hardware)
 
 ### Improvements
@@ -32,6 +35,32 @@
 >> The simpler steps result in XC8 toolchain generating appropriate assembly
 >> instructions and therefore in working pieces of code.
 
+### New features
+
+#### mikroSDK
+
+Added following macro patterns:
+
++ `GPIO_Pxy`
+  + Replaces `Pxy`
++ `GPIO_PIN_x`
+  + Replaces `PIN_xy`
++ `GPIO_PORT_x`
+  + Replaces `PORT_xy`
+
+All use of the old macros has been changed by new ones. This affects all board and mcu packages as well.
+
+> Note that old macros shall be left in the SDK for a couple of upcoming versions, giving users time to make adequate changes to any code they might have.
+
+#### CORE
+
+All `mcu.h` header file for XC8 supported MCUs have the following change applied:
+
++ Changed all occurrences of `Pxy` to `_Pxy`
+  + Where `x` i a letter from A to Z and `y` is a number from 0 to 9
+
+> Note that these changes shall be reverted once the old pin definitions are removed from the SDK.
+
 ### NEW HARDWARE
 
 > NOTE: