Phrase(s): (I was) just wondering.
a comment made after hearing a response to a previous question. (See examples for typical patterns.) • John: Do you always keep your film in the refrigerator? Mary: Yes, why? John: I was just wondering. • Bob: Did this cost a lot? Sue: I really don’t think you need to know that. Bob: Sorry. Just wondering.
McGrawhill's American Idioms And Phrasal Verbs