--- a/Infinity.st	Wed Jan 25 08:46:15 2017 +0100
+++ b/Infinity.st	Thu Jan 26 09:11:01 2017 +0100
@@ -197,7 +197,7 @@
 !
 
 - aNumber
-    "Subtracet aNumber from the receiver and answer the result."
+    "Subtract aNumber from the receiver and answer the result."
 
     (aNumber isInfinite and:[aNumber sign == self sign]) ifTrue: [
         self errorUndefinedResult: #-.