diff --git a/suo.gemspec b/suo.gemspec
index 917c258..149f28e 100644
--- a/suo.gemspec
+++ b/suo.gemspec
@@ -9,7 +9,7 @@ Gem::Specification.new do |spec|
   spec.authors       = ["Nick Elser"]
   spec.email         = ["nick.elser@gmail.com"]
 
-  spec.summary       = %q(Distributed locks using Memcached or Redis.)
+  spec.summary       = %q(Distributed locks (mutexes & semaphores) using Memcached or Redis.)
   spec.description   = %q(Distributed locks (mutexes & semaphores) using Memcached or Redis.)
   spec.homepage      = "https://github.com/nickelser/suo"
   spec.license       = "MIT"