diff --git a/Extensions.md b/Extensions.md
index 2fe9ee4..2d411f2 100644
--- a/Extensions.md
+++ b/Extensions.md
@@ -3,7 +3,7 @@
 
 Tahoe has a programmatic API which enables building custom applications on top of the storage infrastructure.  This RESTful interface uses HTTP, so extensions can be implemented as separate processes across a network.
 
- * The [docs/frontends/webapi.txt]source:/docs/frontends/webpi.txt document shows how to control a Tahoe node programmatically.
+ * The [docs/frontends/webapi.txt]source:/docs/frontends/webapi.txt document shows how to control a Tahoe node programmatically.
 
 ## Extension Projects