diff --git a/README.md b/README.md
index 7760d90..510e54f 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ Available as:
 
 ## Performance
 
-Speed and effectiveness of Node.js version compared to [html-minfier](https://github.com/kangax/html-minifier) and [minimize](https://github.com/Swaagie/minimize). See [bench](./bench) folder for more details.
+Speed and effectiveness of Node.js version compared to [html-minfier](https://github.com/kangax/html-minifier) and [minimize](https://github.com/Swaagie/minimize), run on popular already-minified web pages. See [bench](./bench) folder for more details.
 
 <img width="435" alt="Chart showing speed of HTML minifiers" src="https://wilsonl.in/hyperbuild/bench/0.1.0/average-speeds.png"> <img width="435" alt="Chart showing effectiveness of HTML minifiers" src="https://wilsonl.in/hyperbuild/bench/0.1.0/average-sizes.png">
 
diff --git a/bench/README.md b/bench/README.md
index dc41857..5257ab2 100644
--- a/bench/README.md
+++ b/bench/README.md
@@ -29,6 +29,8 @@ The [Node.js version of hyperbuild](../nodejs) is tested against [html-minfier](
 |Twitter|https://twitter.com/|
 |Wikipedia|https://en.wikipedia.org/wiki/Soil|
 
+**Note that these pages are already mostly minified.**
+
 For more information on how the tests are fetched, see [fetch.js](./fetch.js).
 
 On this [project's README](../README.md), average graphs are shown. Graphs showing per-test results are shown below: