Glossary - Clefs
The Glossary entry for Clefs reads
Sign at the beginning of a →staff, used to tell which are the musical notes on the lines and between the lines.
Clefs are very useful for →transposition."
That last bit is wrong. Transposition means changing pitches. Clefs don't change pitches they just determine where those pitches appear on the stave. Clefs have nothing to do with transposition.
I tried to edit the page but after deleting that line, the preview seemed to show a huge section had disappeared - up to "Note Entry" - and so I chickened out.