--- a/toolkit/components/telemetry/docs/collection/experiments.rst
+++ b/toolkit/components/telemetry/docs/collection/experiments.rst
@@ -32,9 +32,9 @@ This synchronously returns a dictionary 
 
     Both ``setExperimentActive`` and ``setExperimentInactive`` trigger a new subsession. However
     the latter only does so if there was an active experiment with the provided ``id``.
 
 Limits and restrictions
 -----------------------
 To prevent abuses, the content of both the experiment ``id`` and ``branch`` is limited to
 100 characters in length.
-``type`` is limited to a lenght of 20 characters.
+``type`` is limited to a length of 20 characters.