How do you read the histone code?
The "histone code" is not like the genetic code where one codon in an ORF always is translated to a single amino acid. It's closer to something like GC content or CpG islands: a single instance doesn't tell you anything, but enrichment over some finite window may be biologically significant.

You may want to review the basics, starting with the Wikipedia page on the histone code. In particular read the paragraphs at the end:


  Every nucleosome in a cell can therefore have a different set of
  modifications, raising the question of whether common patterns of
  histone modifications exist. A recent study of about 40 histone
  modifications across human gene promoters found over 4000 different
  combinations used, over 3000 occurring at only a single promoter.
  However, patterns were discovered including a set of 17 histone
  modifications that are present together at over 3000 genes.[13]
  Therefore, patterns of histone modifications do occur but they are
  very intricate, and we currently have detailed biochemical
  understanding of the importance of a relatively small number of
  modifications.