In Psalms, strings of words were missing, but were then inserted above the line or after the line by the same scribe. These additional words (often ten or twelve in a row) are written in the same hand, but smaller.
The formal text is accompanied by extensive notes in the margin in Amharic, called 'anedemtā' commentary, which serves as a reminder to the reader of commentaries about the specific words or passages next to which the notes are written.