--- a/docs/obs-terms.rst	Fri Sep 14 10:07:15 2012 -0400
+++ b/docs/obs-terms.rst	Fri Sep 14 10:07:31 2012 -0400
@@ -169,7 +169,7 @@
 | Rewriting operation refuse to work on immutable changeset.                   |
 |                                                                              |
 | Obsolete markers that refer an immutable changeset as precursors have        |
-| no effect on the precussors but may have effect on the successors.           |
+| no effect on the precursors but may have effect on the successors.           |
 |                                                                              |
 | When a *mutable* changeset becomes *immutable* (changing its phase from draft|
 | to public) it is just *immutable* and loose any property of it's former      |