diff --git a/README.md b/README.md
index 1e52da8cf..2e1599c7e 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ $ GIT_EXTERNAL_DIFF=difft git show --ext-diff 72675567c68f002d828945badbb07fe963
 
 $ git clone git@github.com:rust-itertools/itertools.git
 $ cd itertools
-$ GIT_EXTERNAL_DIFF=difft git show --ext-diff 38805c6a882a9f00615078250ccc8c070c3a214d
+$ DFT_WIDTH=100 GIT_EXTERNAL_DIFF=difft git show --ext-diff 38805c6a882a9f00615078250ccc8c070c3a214d
 
 -->
 
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diff --git a/img/rust.png b/img/rust.png
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