supplementary explanation; additional clarification
Used when adding extra information to clarify or complete a previous statement, often in formal or instructional contexts.
I will add a supplementary explanation on this point later.
Please mark the parts that need additional clarification.
補足 is the act of supplementing or the supplement itself, while 補足説明 specifically refers to the explanatory supplement.
説明 is a general explanation, whereas 補足説明 is an explanation that supplements or clarifies something already stated.
Compound of 補足 (supplement) and 説明 (explanation).