diff --git a/README.md b/README.md
index 7a570d5e..8db54c8b 100644
--- a/README.md
+++ b/README.md
@@ -768,7 +768,7 @@ The default fragment style is to start out invisible and fade in. This style can
 	<p class="fragment fade-out">fade-out</p>
 	<p class="fragment fade-up">fade-up (also down, left and right!)</p>
 	<p class="fragment fade-in-then-out">fades in, then out when we move to the next step</p>
-	<p class="fragment fade-in-then-half-out">fades in, then 50% out when we move to the next step</p>
+	<p class="fragment fade-in-then-semi-out">fades in, then obfuscate when we move to the next step</p>
 	<p class="fragment highlight-current-blue">blue only once</p>
 	<p class="fragment highlight-red">highlight-red</p>
 	<p class="fragment highlight-green">highlight-green</p>
diff --git a/css/reveal.css b/css/reveal.css
index 04b704d1..d937704a 100644
--- a/css/reveal.css
+++ b/css/reveal.css
@@ -136,13 +136,13 @@ body {
     opacity: 1;
     visibility: inherit; }
 
-.reveal .slides section .fragment.fade-in-then-half-out {
+.reveal .slides section .fragment.fade-in-then-semi-out {
   opacity: 0;
   visibility: hidden; }
-  .reveal .slides section .fragment.fade-in-then-half-out.visible {
+  .reveal .slides section .fragment.fade-in-then-semi-out.visible {
     opacity: 0.5;
     visibility: inherit; }
-  .reveal .slides section .fragment.fade-in-then-half-out.current-fragment {
+  .reveal .slides section .fragment.fade-in-then-semi-out.current-fragment {
     opacity: 1;
     visibility: inherit; }
 
diff --git a/css/reveal.scss b/css/reveal.scss
index 7e2701b6..80798d33 100644
--- a/css/reveal.scss
+++ b/css/reveal.scss
@@ -171,7 +171,7 @@ body {
 	}
 }
 
-.reveal .slides section .fragment.fade-in-then-half-out {
+.reveal .slides section .fragment.fade-in-then-semi-out {
 	opacity: 0;
 	visibility: hidden;
 
diff --git a/demo.html b/demo.html
index df87fb27..8aa4aba9 100644
--- a/demo.html
+++ b/demo.html
@@ -146,7 +146,7 @@
 							<span style="display: inline-block;" class="fragment fade-left">left</span>
 						</p>
 						<p class="fragment fade-in-then-out">fade-in-then-out</p>
-						<p class="fragment fade-in-then-half-out">fade-in-then-half-out</p>
+						<p class="fragment fade-in-then-semi-out">fade-in-then-semi-out</p>
 						<p>Highlight <span class="fragment highlight-red">red</span> <span class="fragment highlight-blue">blue</span> <span class="fragment highlight-green">green</span></p>
 					</section>
 				</section>