So let me now sound a note of caution.

They also sounded a note of caution on the technique.

Our third theme will, however, sound several notes of caution.

The study sounded a note of caution on one issue.

I should like, however, to sound a note of caution.

However, I have to sound a note of caution.

I should like to raise a note of caution here.

However, I feel obliged to urge a note of caution.

I think these figures have to be taken with a note of caution.

The article gave a note of caution to anyone planning on going to the region.