diff --git a/Doc.md b/Doc.md
index 5db669e..73a4e18 100644
--- a/Doc.md
+++ b/Doc.md
@@ -4,7 +4,7 @@
  * [architecture.txt]source:docs/architecture.txt, explaining the design decisions that have given the grid its current shape
  * [roadmap.txt]source:roadmap.txt, showing how the functionality has been incrementally improved so far, and what improvements we plan to make next
  * [codemap.txt]source:docs/codemap.txt, laying out the software design and the organization of the source code
- * [UseCases](UseCases), enumerating the ways in which Tahoe should be usefula
+ * [UseCases](UseCases), enumerating the ways in which Tahoe should be useful
 
 ## The Parade of Release Notes
  * [the release notes]source:relnotes.txt@686 announcing the first public release on May 2, 2007 and giving a general overview of why the Tahoe project exists