diff --git a/README.md b/README.md
index 5bc5399ec..35a2c1be4 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
-# Welcome to QZDoom!
 [![QZDoom Logo](https://forum.drdteam.org/download/file.php?id=3080)](https://zdoom.org/)
+# Welcome to QZDoom!
 
 [![Build Status](https://ci.appveyor.com/api/projects/status/github/raa-eruanna/qzdoom?branch=master&svg=true)](https://ci.appveyor.com/project/raa-eruanna/qzdoom) [![Build Status](https://travis-ci.org/raa-eruanna/qzdoom.svg?branch=master)](https://travis-ci.org/raa-eruanna/qzdoom)
 
@@ -19,6 +19,6 @@ Special thanks to Coraline of the 3DGE team for allowing us to use her README.md
 
 ## How to build QZDoom
 
-To build QZDoom, please see the [wiki](https://zdoom.org/wiki/) and see the "Programmer's Corner" on the bottom-right corner of the page to build for your plaform.
+To build QZDoom, please see the [wiki](https://zdoom.org/wiki/) and see the "Programmer's Corner" on the bottom-right corner of the page to build for your platform.
 
 Follow the same instructions as with GZDoom, except substituting "coelckers/gzdoom" with "raa-eruanna/qzdoom" in order to link this repository in your build environment.
diff --git a/src/g_level.cpp b/src/g_level.cpp
index 0b211f3e6..17f76a67d 100644
--- a/src/g_level.cpp
+++ b/src/g_level.cpp
@@ -2028,6 +2028,10 @@ DEFINE_FIELD(FLevelLocals, F1Pic)
 DEFINE_FIELD(FLevelLocals, maptype)
 DEFINE_FIELD(FLevelLocals, Music)
 DEFINE_FIELD(FLevelLocals, musicorder)
+DEFINE_FIELD(FLevelLocals, skytexture1)
+DEFINE_FIELD(FLevelLocals, skytexture2)
+DEFINE_FIELD(FLevelLocals, skyspeed1)
+DEFINE_FIELD(FLevelLocals, skyspeed2)
 DEFINE_FIELD(FLevelLocals, total_secrets)
 DEFINE_FIELD(FLevelLocals, found_secrets)
 DEFINE_FIELD(FLevelLocals, total_items)
@@ -2093,3 +2097,19 @@ CCMD(skyfog)
 	}
 }
 
+
+//==========================================================================
+//
+// ZScript counterpart to ACS ChangeSky, uses TextureIDs
+//
+//==========================================================================
+DEFINE_ACTION_FUNCTION(FLevelLocals, ChangeSky)
+{
+	PARAM_SELF_STRUCT_PROLOGUE(FLevelLocals);
+	PARAM_INT(sky1);
+	PARAM_INT(sky2);
+	sky1texture = self->skytexture1 = FSetTextureID(sky1);
+	sky2texture = self->skytexture2 = FSetTextureID(sky2);
+	R_InitSkyMap();
+	return 0;
+}
diff --git a/wadsrc/static/zscript/base.txt b/wadsrc/static/zscript/base.txt
index bef1751da..503efa453 100644
--- a/wadsrc/static/zscript/base.txt
+++ b/wadsrc/static/zscript/base.txt
@@ -591,6 +591,10 @@ struct LevelLocals native
 	native readonly int maptype;
 	native readonly String Music;
 	native readonly int musicorder;
+	native readonly TextureID skytexture1;
+	native readonly TextureID skytexture2;
+	native float skyspeed1;
+	native float skyspeed2;
 	native int total_secrets;
 	native int found_secrets;
 	native int total_items;
@@ -640,7 +644,9 @@ struct LevelLocals native
 	native static clearscope vector3 Vec3Diff(vector3 v1, vector3 v2);
 
 	native String GetChecksum() const;
-	
+
+	native void ChangeSky( TextureID sky1, TextureID sky2 );
+
 	String TimeFormatted(bool totals = false)
 	{
 		int sec = Thinker.Tics2Seconds(totals? totaltime : time);