diff --git a/MANUAL.txt b/MANUAL.txt
index 7d6d56f48..934556c8a 100644
--- a/MANUAL.txt
+++ b/MANUAL.txt
@@ -2930,7 +2930,7 @@ Or, without the `bracketed_spans` extension:
     <span class="smallcaps">Small caps</span>
 
 For compatibility with other Markdown flavors, CSS is also supported:
-    
+
     <span style="font-variant:small-caps;">Small caps</span>
 
 This will work in all output formats that support small caps.
@@ -2998,6 +2998,8 @@ HTML, Slidy, DZSlides, S5, EPUB
     command-line options selected. Therefore see [Math rendering in HTML]
     above.
 
+This extension can be used with both `markdown` and `html` input.
+
 [interpreted text role `:math:`]: http://docutils.sourceforge.net/docs/ref/rst/roles.html#math
 
 Raw HTML
@@ -3708,6 +3710,8 @@ TeX math, and anything between `\[` and `\]` to be interpreted
 as display TeX math.  Note: a drawback of this extension is that
 it precludes escaping `(` and `[`.
 
+This extension can be used with both `markdown` and `html` input.
+
 #### Extension: `tex_math_double_backslash` ####
 
 Causes anything between `\\(` and `\\)` to be interpreted as inline