diff --git a/reference/intl/book.xml b/reference/intl/book.xml
index 672b47e2ea..62be85c83a 100644
--- a/reference/intl/book.xml
+++ b/reference/intl/book.xml
@@ -11,7 +11,8 @@
   <para>
    Internationalization extension (further is referred as Intl) is a wrapper
    for <link xlink:href="&url.icu.home;">ICU</link>
-   library, enabling PHP programmers to perform UCA-conformant collation and
+   library, enabling PHP programmers to perform
+   <link xlink:href="&url.icu.uca;">UCA</link>-conformant collation and
    date/time/number/currency formatting in their scripts.
   </para>
 
diff --git a/reference/intl/collator/create.xml b/reference/intl/collator/create.xml
index 7d17833a93..627b60054c 100644
--- a/reference/intl/collator/create.xml
+++ b/reference/intl/collator/create.xml
@@ -40,7 +40,7 @@
        The locale containing the required collation rules. Special values for
        locales can be passed in - if null is passed for the locale, the
        default locale collation rules will be used. If empty string ("") or
-       "root" are passed, UCA rules will be used.
+       "root" are passed, <link xlink:href="&url.icu.uca;">UCA</link> rules will be used.
       </para>
      </listitem>
     </varlistentry>