Yue Wu 写道:
> After I check, you are right, it's an iskeyword issue, but I don't know  
> why my
> help file has the different settings for iskeyword? It's a file not  
> located in
> $runtimepath/doc, it's in other dir. now I have to use local modeline:
>   vim:tw=78:ts=8:ft=help:norl:iskeyword+=-:iskeyword+=.:
> to make it work.
> 

afaik all help files specify its own modeline. try :help
and go to the last line, you see:

vim:tw=78:fo=tcq2:isk=!-~,^*,^\|,^\":ts=8:ft=help:norl:

Since the above lies in the official help.txt, we can safely think that 
this is the official way to write a help file. (see isk= in help.txt)


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