The phrase "an additional text" is correct and usable in written English.
It can be used when referring to a supplementary piece of writing or information that complements the main content.
Example: "Please include an additional text that elaborates on the main topic for better understanding."
Alternatives: "a supplementary text" or "an extra text".
We understand this classroom method may be new for some teachers, and so we provide an additional text guide to using inquiry in the elementary school classroom.
So this year, perhaps pressing our luck (and patience), I'm thinking of proposing the reading of an additional text: Thomas Jefferson's letter to Roger Weightman of June 24 , 1826
Not long ago, an additional text was discovered in an ancient linen backpack found in a cave outside Jerusalem, surrounded by what appeared to be early-Roman candy wrappers and covered with stickers reading "I [heart] All Faiths" and "Ask Me About Hell".
The implementation of BioMart in EMAGE now allows an additional text based interface that addresses a need for focussed searches across all of the text based information held in EMAGE.
It will just be differentiated with an additional text at the end of its filename.
An additional text file discusses the major technical features that this provisional product will address (see Additional file 1).
After entering the LM answer, students in group A were given the chance to type their answer term into a additional text cell, immediately following the LM window.
An additional text-based STD system was built from DNNs.
Palimpsest, manuscript in roll or codex form carrying a text erased, or partly erased, underneath an apparent additional text.
At a minimum this could be additional text clearly displayed in a location where it will be seen and written in accessible language, and a line on the consent form that when ticked indicates agreement.
There's Little Mat, A Favorite Patriotic Whig Song and Trio; additional text There's Jemmy [sic] Polk.
