diff --git a/Installation-Guide.md b/Installation-Guide.md
index b74d3d5..b5e47b8 100644
--- a/Installation-Guide.md
+++ b/Installation-Guide.md
@@ -50,7 +50,7 @@ After the copying is done, insert the PLASMA2-DEM floppy in the drive and type:
 ```
 The system is now installed.
 
-## Apple II 800K image
+## Apple II 800K disk image
 There is a 800K disk image, `PLASMA.2mg`, that has a full, bootable installation of PLASMA and the EDASM assembler. This makes for a complete development environment. It can be booted as-is, or copied en-mass to fixed disk.
 
 ## Apple /// boot floppy