Emacs makefile mode - Commented text turns tab pink

Heime <[email protected]>
Newsgroups gmane.emacs.help
Message-ID <vh3pMgsklpU10OEwaj44ACQ1r8nHV13-uoSKST5bTZL_xfpuLeeDMBz71UgIZWbunN0MBb8zAFRTmkk1bSuUxUEcykpeoUryEgH_9ocxsRw=@protonmail.com>
I made a makefile with some comments. In Emacs the tab of the 
comment turns pink.  An I doing something wrong?

$(trgdir)/antares.info: $(srcdir)/antares.texi
	## Make any missing parent directories
	mkdir -p $(trgdir)
	$(MAKEINFO) $(MAKEINFOFLAGS) -o $@ $<
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