Vignettes do not appear on CRAN if files are placed in /vignette subdirectory - but they do appear if placed in /inst/doc

Dear all,

In my gRbase package there are 3 vignettes placed in the /vignette subdirectory. These vignettes do not appear on http://cran.r-project.org/web/packages/gRbase/index.html and neither do they appear if I open a browser with help("gRbase").

However, if instead I place the vignettes in /inst/doc then they will appear in the browser opened with help("gRbase") - and they also appear on CRAN.

Is this how it should be or am I missing something?

Best regards
S?ren

sessionInfo()

R version 3.0.1 Patched (2013-06-11 r62941)
Platform: x86_64-w64-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=Danish_Denmark.1252  LC_CTYPE=Danish_Denmark.1252 [3] 
LC_MONETARY=Danish_Denmark.1252 LC_NUMERIC=C [5] 
LC_TIME=Danish_Denmark.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
  [1] gRain_1.1-2             gRbase_1.6-10           graph_1.38.0
  [4] igraph_0.6.5-2          RcppArmadillo_0.3.900.0 RcppEigen_0.3.1.2.1
  [7] Matrix_1.0-12           lattice_0.20-15         Rcpp_0.10.3
[10] MASS_7.3-26             shTools_1.0             markdown_0.5.4
[13] knitr_1.2

loaded via a namespace (and not attached):
  [1] BiocGenerics_0.6.0 digest_0.6.3       evaluate_0.4.3     formatR_0.7
  [5] grid_3.0.1         parallel_3.0.1     RBGL_1.36.2        stats4_3.0.1
  [9] stringr_0.6.2      tools_3.0.1