diff --git a/docs/install-generic-unix-dev.md b/docs/install-generic-unix-dev.md
index 855eadc3d9..24e8af1e2b 100644
--- a/docs/install-generic-unix-dev.md
+++ b/docs/install-generic-unix-dev.md
@@ -24,7 +24,7 @@ Install the following non-Python dependencies:
 
 ### On Debian or Ubuntu systems:
 
-#### Using the official Ubuntu repositories and `tsearch-extras` deb package:
+#### Using the official Ubuntu repositories, PGroonga PPA and `tsearch-extras` deb package:
 
 Start by cloning this repository: `git clone
 https://github.com/zulip/zulip.git`
@@ -36,6 +36,14 @@ sudo apt-get install closure-compiler libfreetype6-dev libffi-dev \
     hunspell-en-us nodejs nodejs-legacy npm git yui-compressor \
     puppet gettext postgresql
 
+# Next, install PGroonga from its PPA
+sudo add-apt-repository -y ppa:groonga/ppa
+sudo apt-get update
+# On 14.04
+sudo apt-get install postgresql-9.3-pgroonga
+# On 16.04
+sudo apt-get install postgresql-9.5-pgroonga
+
 # Next, install Zulip's tsearch-extras postgresql extension
 # If on 14.04 or 16.04, you can use the Zulip PPA for tsearch-extras:
 cd zulip