diff --git a/spec/annexes.html b/spec/annexes.html
index e23ab569..21930dce 100644
--- a/spec/annexes.html
+++ b/spec/annexes.html
@@ -110,6 +110,9 @@ <h1>Implementation Dependent Behaviour</h1>
         <li>
           The patterns used for formatting values as decimal, percent, currency, or unit values per locale, with or without the sign, with or without accounting format for currencies, and in standard, compact, or scientific notation (<emu-xref href="#sec-formatnumber"></emu-xref>)
         </li>
+        <li>
+          The number of fractional digits used when formatting currency values (<emu-xref href="#sec-formatnumber"></emu-xref>)
+        </li>
         <li>
           Localized representations of *NaN* and *Infinity* (<emu-xref href="#sec-formatnumber"></emu-xref>)
         </li>
diff --git a/spec/numberformat.html b/spec/numberformat.html
index cc5fc544..c1c5aa30 100644
--- a/spec/numberformat.html
+++ b/spec/numberformat.html
@@ -684,18 +684,20 @@ <h1>Properties of Intl.NumberFormat Instances</h1>
   <emu-clause id="sec-numberformat-abstracts">
     <h1>Abstract Operations for NumberFormat Objects</h1>
 
-    <emu-clause id="sec-currencydigits" type="abstract operation">
+    <emu-clause id="sec-currencydigits" type="implementation-defined abstract operation">
       <h1>
         CurrencyDigits (
           _currency_: a String,
         ): a non-negative integer
       </h1>
       <dl class="header">
+        <dt>description</dt>
+        <dd></dd>
       </dl>
+
       <emu-alg>
         1. Assert: IsWellFormedCurrencyCode(_currency_) is *true*.
-        1. Assert: _currency_ is the ASCII-uppercase of _currency_.
-        1. If the ISO 4217 currency and funds code list contains _currency_ as an alphabetic code, return the minor unit value corresponding to the _currency_ from the list; otherwise, return 2.
+        1. Return a non-negative integer indicating the number of fractional digits used when formatting quantities of the currency corresponding to _currency_. If there is no available information on the number of digits to be used, return 2.
       </emu-alg>
     </emu-clause>