It's the kind of instruction I would expect in "scordatura" situations where an instrument is retuned or modified or stuffed beyond pitch accuracy.
In that case, "actual notes" would mean that the given notes are the sounding notes rather than what one should be fingering on the instrument if it were unmodified.
Another, probably less likely, option would be for a short passage with a different instrument than the preceding passage to indicate that this passage is not written in this instrument's typical transposing notation but in concert pitch.
And, even more unlikely, it might be an English rendition of "loco", meaning that a previously written octave shift is to be abandoned here.