diff --git a/README.md b/README.md
index 28bc572..74a9c9f 100644
--- a/README.md
+++ b/README.md
@@ -2,4 +2,4 @@
 
 n-puzzle : a python n-puzzle solver using A\* algorithm.
 
-It features a GLSL shaders for visualizing the solution.
+It features a GLSL shader for visualizing the solution.