diff --git a/_mixins.sass b/_mixins.sass
index 69feeca..a44dab0 100644
--- a/_mixins.sass
+++ b/_mixins.sass
@@ -78,6 +78,15 @@
     iteration-count: infinite
     timing-function: linear
 
+/*
+ * Add a pulse animation.
+ * $speed: 1s (default), seconds
+ * $size: 1rem (default), unit
+ * $color: black (default), color
+ * $iteration: infinite (default), number
+ *
+ * Examples: @include animationPulse(2s), @include animationPulse(0.5s, 2rem, yellow, 1)
+ */    
 @mixin animationPulse($speed: 1s, $size: 1rem, $color: black, $iteration: infinite)
   $id: unique-id()
   @keyframes #{$id}