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Perhaps the most intuitive way to annotate a PDF document is to add an electronic sticky note . While physical sticky notes are useful with hard-copy documents , electronic sticky notes are more efficient and provide a natural and familiar means by which to add and share comments on PDF documents without obscuring their content . Clearly they have been OCR 'd ( optical character recognition 'd ) , that is , the scanned pages have had the text converted to indexable , searchable text ( after all , you can search them on the Web ) , yet they ca n't be searched when you download them . When he heard a voice thus calling to him , he was standing at the door of his box , with a flag in his hand , furled round its short pole . The accompanist must have rock-steady tempo ; he must be familiar enough with ballet classes to know what kind of music is used for the most common exercises at the barre ; he must have a copious repertoire at his fingertips so that he can always come up with something suitable on no notice at all ; and he must be ready for the unexpected - - for example , if the teacher requests a sudden increase in speed . Let your shoulders be low , your head high , and your countenance animated and expressive .