diff --git a/File Formats/Code/Lua.md b/File Formats/Code/Lua.md
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--- a/File Formats/Code/Lua.md	
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-# *COS 2:* Lua
-
-## Quick information
-
-| Information |                           |
-| ----------- | ------------------------- |
-| Type        | Plain text file format    |
-| MIME        | `text/lua`                |
-| Extensions  | `.lua`                    |
-
-## Technical details
-
-*This format is based upon [plain text](/File%20Formats/Documents/Plain%20Text.md) and as such technical details that apply to plain text also apply to this format.*
-
-Lua code files should contain valid, executable Lua code. These can either be self-contained programs, APIs or Lua otherwise loaded by a program.
diff --git a/File Formats/Lua/Program.md b/File Formats/Lua/Program.md
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+# *COS 2:* Lua Program
+
+## Quick information
+
+| Information |                           |
+| ----------- | ------------------------- |
+| Type        | Lua Program               |
+| MIME        | `lua/program`             |
+| Extensions  | `.prg`, `.lua` *See '.lua extension'*|
+
+## Technical details
+
+*This format is based upon [plain text](/File%20Formats/Documents/Plain%20Text.md) and as such technical details that apply to plain text also apply to this format.*
+
+A Lua program file *must* contain valid Lua code which will immediately execute code upon being run, rather than simply returning data or loading functions. There is no requirement for a 'program' to have any user interaction or utilise the screen, but to simply *run* code rather than *load* it.
+
+### Note: Usage of `.lua` extension
+
+A file with the `.lua` extension by default should be assumed to be a Lua program, not any other type of Lua file. However, you should never use the `.lua` extension when creating new files unless the user manually specifies it.
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