diff --git a/doc/developers/performance.rst b/doc/developers/performance.rst
index df92089dd345b36f623d395c8e100bda3d80c254..0ad41037bf98b189b2e3699a533bd5e69863434e 100644
--- a/doc/developers/performance.rst
+++ b/doc/developers/performance.rst
@@ -190,7 +190,7 @@ us install ``line-prof`` and wire it to IPython::
 
     $ ipython profile create
 
-  Then create a file named ``~/.ipython/extensions/line_profile_ext`` with
+  Then create a file named ``~/.ipython/extensions/line_profiler_ext.py`` with
   the following content::
 
     import line_profiler