diff --git a/README.md b/README.md
index 3a3c72c78008f9b092a6319384d66f68fc1a0402..33e1927775feeedeb04e45ffbcb04dd53405c811 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ projector: {
 
 The focal lengths are in pixel units.
 
-## Extrinsic Calibration
+## Extrinsics Calibration
 
 To calbrate the extrinsics we create a reference image in real space which we will line up with a projected image. Once again this is a hack but it's quick! In our case we drew the corners of a rectangle on a piece of cardboard.