Emphasise that "u" only refers to explicitly underlined text

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index a49656c..570651a 100644
--- a/README.md
+++ b/README.md
@@ -211,7 +211,7 @@ var options = {
 By default, the underlining of any text is ignored since underlining can be confused with links in HTML documents.
 This behaviour can be changed by adding a style mapping for `u`.
 For instance, suppose that a source document uses underlining for emphasis.
-The following will wrap any underlined source text in `<em>` tags:
+The following will wrap any explicitly underlined source text in `<em>` tags:
 
 ```javascript
 var mammoth = require("mammoth");