diff --git a/README b/README
index 735c7a8..72d2b69 100644
--- a/README
+++ b/README
@@ -208,6 +208,9 @@ fugitive: README
     Its value is the hash corresponding to the last commit that provoked the
     (re)generation of the file.
   </dd>
+  <p class="note">
+    This is case-sensitive. Compare this with the next one.
+  </p>
   <dt>commit_hash</dt>
   <dd>
     Its value is the short hash (the seven first digit of the hash)