diff --git a/changelog.md b/changelog.md
index 8416627..106203d 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,16 @@
+* Only windows platform is supported.
+* Only 64-bit compilation is supported.
+* The codebase is compiled as C++ code.
+* Project files are provided for Visual Studio 2017.
+* Vulkan support.
+
+New cvars:
+* r_renderAPI - 3D API to use: 0 - OpenGL, 1 - Vulkan. Requires vid_restart.
+
+* r_twinMode - Debug feature to compare rendering output between OpenGL and Vulkan APIs.
+    If enabled, renderer uses both APIs and renders current frame to two side-by-side windows.
+    Requires vid_restart.
+
 Removed cvars:
 * r_allowExtensions (always use extensions if available)
 * r_allowSoftwareGL