diff --git a/README.md b/README.md
index 5b2385a..ce1f2e7 100644
--- a/README.md
+++ b/README.md
@@ -16,8 +16,8 @@ For system-wide installation, you must have permissions and use with `sudo`.
 
 **REEFFIT** requires the following *Python* packages as dependencies, all of which can be installed through [`pip`](https://pip.pypa.io/).
 ```json
-cvxopt >= 1.1.6
-joblib >= 0.5.4
+cvxopt == 1.1.6
+0.11 >= joblib >= 0.5.4
 matplotlib >= 1.1.1
 numpy >= 1.6.1
 scipy >= 0.9.0
@@ -26,6 +26,8 @@ pymc >= 2.2
 rdatkit >= 1.0.4
 ```
 
+* To use the --njobs parameter currently, joblib package version needs to be 0.11 or less and cvxopt version needs to be 1.1.6
+
 * Note that you should have `RDATKit` installed and properly set up as well (see https://github.com/ribokit/RDATKit)
 
 * In your profile (e.g. `~/.bashrc`), include an environment variable `REEFFIT_HOME` that points to the **REEFFIT** home directory, e.g.: