diff --git a/README.md b/README.md
index 4fb9c0d..bf33e39 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@
 The appropriate installation app file(s) must be located in `/Applications` i.e.
 
 ```
+/Applications/Install macOS Catalina.app
 /Applications/Install macOS Mojave.app
 /Applications/Install macOS High Sierra.app
 /Applications/Install macOS Sierra.app
@@ -29,9 +30,9 @@ $ brew install osx-iso
 ```sh
 $ osxiso
 
-1) macOS Mojave       4) OS X El Capitan    7) Quit
-2) macOS High Sierra  5) OS X Yosemite
-3) macOS Sierra       6) OS X Mavericks
+1) macOS Catalina     4) macOS Sierra       7) OS X Mavericks
+2) macOS Mojave       5) OS X El Capitan    8) Quit
+3) macOS High Sierra  6) OS X Yosemite
 
 Select OS or Quit:
 ```
diff --git a/osxiso b/osxiso
index 26ff467..e8e331e 100755
--- a/osxiso
+++ b/osxiso
@@ -9,8 +9,9 @@ Select OS or Quit: "
   build_mount="/Volumes/install_build"
   app_mount="/Volumes/install_app"
   apps_v1="|macOS Sierra|OS X El Capitan|OS X Yosemite|OS X Mavericks|"
-  apps_v2="|macOS High Sierra|macOS Mojave|"
+  apps_v2="|macOS High Sierra|macOS Mojave|macOS Catalina|"
   apps=(
+    "macOS Catalina"
     "macOS Mojave"
     "macOS High Sierra"
     "macOS Sierra"
@@ -117,8 +118,8 @@ Select OS or Quit: "
 
     prep_build "$1"
 
-    # Create a blank ISO of 7316MB with a Single Partition
-    hdiutil create -o "$temp/$1.cdr" -size 7316m -layout SPUD -fs HFS+J
+    # Create a blank ISO of 8121MB (7,93 GiB) with a Single Partition
+    hdiutil create -o "$temp/$1.cdr" -size 8121m -layout SPUD -fs HFS+J
 
     # Mount the blank ISO
     hdiutil attach "$temp/$1.cdr.dmg" -noverify -nobrowse -mountpoint "$build_mount"