diff --git a/common/templates/mathjax_include.html b/common/templates/mathjax_include.html
index a57ef69e13..3484ace401 100644
--- a/common/templates/mathjax_include.html
+++ b/common/templates/mathjax_include.html
@@ -9,14 +9,14 @@
<%page args="disable_fast_preview=True"/>
%if disable_fast_preview:
-// Fast Preview was introduced in 2.5. However, it
-// causes undesirable flashing/font size changes when
-// MathJax is used for interactive preview (equation editor).
-// Setting processSectionDelay to 0 (see below) fully eliminates
-// fast preview, but to reduce confusion, we are also setting
-// the option as displayed in the context menu to false.
-// When upgrading to 2.6, check if this variable name changed.