spelling

CHANGES

diff --git a/CHANGES b/CHANGES
index 3193407..91f4e56 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,7 +4,7 @@
 
  Changes between 0.9.5 and 0.9.5a  [XX XXX 2000]
 
-  *) Add compatability options to the purpose and trust code. The
+  *) Add compatibility options to the purpose and trust code. The
      purpose X509_PURPOSE_ANY is "any purpose" which automatically
      accepts a certificate or CA, this was the previous behaviour,
      with all the associated security issues.