diff --git a/reference/datetime/dateinterval/format.xml b/reference/datetime/dateinterval/format.xml
index d505658ba5..a5d35178a0 100644
--- a/reference/datetime/dateinterval/format.xml
+++ b/reference/datetime/dateinterval/format.xml
@@ -30,7 +30,7 @@
         <title>
          The following characters are recognized in the
          <parameter>format</parameter> parameter string.
-         Each format character must be proceeded by a percent sign
+         Each format character must be prefixed by a percent sign
          (<literal>%</literal>).
         </title>
         <tgroup cols="3">