diff --git a/README.md b/README.md
index 29d46793458f56ca1d05de47847e9eeb19fceff5..ccab8e51bb0574e4c6bc296e1157d916131029eb 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,15 @@ If this does not work and you installed the packages directly from Github, try i
 ```
 install_github("chorscroft/zalpha", build_vignettes=TRUE)  # might also have to include the option force=TRUE if the package is already installed
 ```
+
+## Dependencies
+
+This package requires R version 2.10 or higher.
+
+Optional packages:
+
+* fitdistrplus
+
 ## Authors
 
 * **Clare Horscroft**