diff --git a/impeller/docs/coordinate_system.md b/impeller/docs/coordinate_system.md
index 9010610f3c90e..7da7af20c0575 100644
--- a/impeller/docs/coordinate_system.md
+++ b/impeller/docs/coordinate_system.md
@@ -1,4 +1,4 @@
-# Impellers Coordinate System
+# Impeller's Coordinate System
 
 **TL;DR, Impeller uses the Metal coordinate system.**