diff --git a/INSTALL.md b/INSTALL.md
index 6b0812c..0646930 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -23,14 +23,15 @@ inform you. But it's still nice to have a list here. The list below isn't a
 complete list, it's just libraries that people have found missing while
 building, and let me know.
 
-- PostgreSQL client library
+- libgmp
+- libpcre
 - ZLib
 - libssl
-- libpcre
+- PostgreSQL client library
 
 On Debian based distros, installation can be done like this:
 
-    $ sudo apt install libpq-dev zlib1g-dev libssl-dev libpcre3-dev
+    $ sudo apt install libpq-dev zlib1g-dev libssl-dev libpcre3-dev libgmp-dev
 
 # (2) Haskell development tools