Add instructions for `rake dev`

2 files changed, 2 insertions, 1 deletions

diff --git a/README.md b/README.md
index 5393253..3783509 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ Next, install dependencies:
 - Install the native graphics library [Simple 2D](https://github.com/simple2d/simple2d) by following the instructions in its README.
 - Install [MRuby](http://mruby.org) in order to build Ruby 2D apps natively. On macOS using [Homebrew](https://brew.sh), run `brew install mruby`. On Ubuntu, use `sudo apt install mruby libmruby-dev`
 
-Finally, run `rake` to build and install the gem locally.
+Finally, run `rake` to build and install the gem locally. Use `rake dev` to build referencing user-installed libraries (e.g. Simple 2D and SDL).
 
 ## Tests
 
diff --git a/Rakefile b/Rakefile
index 2a8f8a1..5de0597 100644
--- a/Rakefile
+++ b/Rakefile
@@ -58,6 +58,7 @@ task default: 'all'
 
 desc "Run default tasks using user-installed libraries"
 task :dev do
+  puts 'Building using user-installed libraries'.info
   $libs = '-- libs'
   Rake::Task['all'].invoke
 end