@@ -13,12 +13,24 @@

 ## Installation Instructions

-To install the most recent release of celda via devtools:

+To install the most recent release of celda (R >= 3.6) via devtools:

 ```

 library(devtools)

 install_github("campbio/celda")

 ```

+For R3.5 users, please install from the R_3_5 branch:

+```

+library(devtools)

+install_github("campbio/celda@R_3_5")

+```

+

+For backward compatibility with results (`celda_CG` and `celda_list` objects) generated from older versions of celda, please install from the mirror branch 20190409_master:

+```

+library(devtools)

+install_github("campbio/celda@20190409_master")

+```

+

 **NOTE** On OSX, `devtools::install_github()` requires installation of **libgit2.** This can be installed via homebrew:

 ```

 brew install libgit2