diff --git a/docs/install.md b/docs/install.md
index 7d3808d22..1e130a1f6 100644
--- a/docs/install.md
+++ b/docs/install.md
@@ -6,12 +6,12 @@ This document covers the steps necessary to download, build, and deploy Nomulus.
 
 You will need the following programs installed on your local machine:
 
-
 *   A recent version of the [Java 11 JDK][java-jdk11].
 *   [Google App Engine SDK for Java][app-engine-sdk], and configure aliases to
     to the `gcloud` and `appcfg.sh` utilities (you'll use them a lot).
 *   [Git](https://git-scm.com/) version control system.
 *   Python version 3.7 or newer.
+*   gnupg2 (e.g. in run `sudo apt install gnupg2` in Debian-like Linuxes)
 
 **Note:** App Engine does not yet support Java 9. Also, the instructions in this
 document have only been tested on Linux. They might work with some alterations