diff --git a/README.md b/README.md
index 3005435..c899a1f 100644
--- a/README.md
+++ b/README.md
@@ -15,12 +15,13 @@ Genome-wide association studies are widely used to investigate the genetic basis
 * Development version from Github:
 ```
 library("devtools")
+install_github("zhengxwen/gdsfmt")
 install_github("zhengxwen/SNPRelate")
 ```
 The `install_github()` approach requires that you build from source, i.e. `make` and compilers must be installed on your system -- see the R FAQ for your operating system; you may also need to install dependencies manually.
 * Nearly up-to-date development binaries from `gdsfmt` r-forge repository:
 ```
-install.packages("SNPRelate",
+install.packages(c("gdsfmt", "SNPRelate"),
    repos=c("http://gdsfmt.r-forge.r-project.org/repos",
           getOption("repos")[["CRAN"]]))
 ```