diff --git a/README.md b/README.md
index c01e7aa..262d664 100644
--- a/README.md
+++ b/README.md
@@ -8,5 +8,6 @@
 To optionally check out a particular [tagged release](https://github.com/biometrics/openbr/releases):
 
     $ git checkout <tag>
+    $ git submodule update
 
 **[Build Instructions](http://openbiometrics.org/doxygen/latest/installation.html)**