diff --git a/README.md b/README.md
index 1ad92b0..d0bee6f 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ Received file written to README.md
 ```$ pip install magic-wormhole```
 
 On Debian/Ubuntu systems, you may first need `apt-get install python-pip
-build-essential python-dev libffi-dev`. On Fedora it's `python-devel`
+build-essential python-dev libffi-dev libssl-dev`. On Fedora it's `python-devel`
 and `libffi-devel`. On OS-X, you may need to install `pip` and run
 `xcode-select --install` to get GCC. Note: on Windows, only python2 is
 currently supported.