minor documentation improvement
minor documentation improvement

funkey/vigra,ThomasWalter/vigra,ThomasWalter/vigra,cha007/vigra,psteinb/vigra,xiwei-zhang/vigra,capturePointer/vigra,dagophil/vigra,timoMa/vigra,xiwei-zhang/vigra,xiwei-zhang/vigra,mmuellner/vigra,mmuellner/vigra,ThomasWalter/vigra,dagophil/vigra,stuarteberg/vigra,xiwei-zhang/vigra,kod3r/vigra,kod3r/vigra,stuarteberg/vigra,hmeine/vigra,cha007/vigra,capturePointer/vigra,mmuellner/vigra,DaveRichmond-/vigra,capturePointer/vigra,funkey/vigra,xiwei-zhang/vigra,DaveRichmond-/vigra,cha007/vigra,DaveRichmond-/vigra,DaveRichmond-/vigra,funkey/vigra,mmuellner/vigra,stuarteberg/vigra,dstoe/vigra,timoMa/vigra,timoMa/vigra,mmuellner/vigra,DaveRichmond-/vigra,DaveRichmond-/vigra,funkey/vigra,psteinb/vigra,psteinb/vigra,hmeine/vigra,dagophil/vigra,psteinb/vigra,ThomasWalter/vigra,funkey/vigra,dstoe/vigra,kod3r/vigra,funkey/vigra,dagophil/vigra,timoMa/vigra,xiwei-zhang/vigra,dstoe/vigra,dstoe/vigra,cha007/vigra,stuarteberg/vigra,psteinb/vigra,xiwei-zhang/vigra,capturePointer/vigra,cha007/vigra,dagophil/vigra,timoMa/vigra,mmuellner/vigra,hmeine/vigra,psteinb/vigra,mmuellner/vigra,capturePointer/vigra,DaveRichmond-/vigra,kod3r/vigra,hmeine/vigra,funkey/vigra,kod3r/vigra,cha007/vigra,capturePointer/vigra,capturePointer/vigra,ThomasWalter/vigra,ThomasWalter/vigra,kod3r/vigra,cha007/vigra,psteinb/vigra,timoMa/vigra,stuarteberg/vigra,hmeine/vigra,hmeine/vigra,kod3r/vigra,stuarteberg/vigra,ThomasWalter/vigra,timoMa/vigra,stuarteberg/vigra,dstoe/vigra,dstoe/vigra,hmeine/vigra,dagophil/vigra,dstoe/vigra,dagophil/vigra