--- a/Depth1Image.st	Thu Sep 22 15:04:44 2016 +0200
+++ b/Depth1Image.st	Thu Sep 22 15:06:17 2016 +0200
@@ -186,7 +186,7 @@
 !
 
 greyImageAsMonoFormOn:aDevice
-    "convert to a monochrome form - thats easy"
+    "convert to a monochrome form - that's easy"
 
     ^ self anyImageAsFormOn:aDevice
 !