diff --git a/src/allmydata/testing/web.py b/src/allmydata/testing/web.py
index 6656236ca..0d6e7cb6e 100644
--- a/src/allmydata/testing/web.py
+++ b/src/allmydata/testing/web.py
@@ -80,7 +80,7 @@ KNOWN_CAPABILITIES = [
 
 def capability_generator(kind):
     """
-    Deterministically generates a streap of valid capabilities of the
+    Deterministically generates a stream of valid capabilities of the
     given kind. The N, K and size values aren't related to anything
     real.