diff --git a/icu4c/source/common/unicode/ucurr.h b/icu4c/source/common/unicode/ucurr.h
index b219875..c30eadb 100644
--- a/icu4c/source/common/unicode/ucurr.h
+++ b/icu4c/source/common/unicode/ucurr.h
@@ -208,6 +208,13 @@
  * Returns the number of the number of fraction digits that should
  * be displayed for the given currency.
  * This is equivalent to ucurr_getDefaultFractionDigitsForUsage(currency,UCURR_USAGE_STANDARD,ec);
+ *
+ * Important: The number of fraction digits for a given currency is NOT
+ * guaranteed to be constant across versions of ICU or CLDR. For example,
+ * do NOT use this value as a mechanism for deciding the magnitude used
+ * to store currency values in a database. You should use this value for
+ * display purposes only.
+ *
  * @param currency null-terminated 3-letter ISO 4217 code
  * @param ec input-output error code
  * @return a non-negative number of fraction digits to be
@@ -221,6 +228,13 @@
 /**
  * Returns the number of the number of fraction digits that should
  * be displayed for the given currency with usage.
+ *
+ * Important: The number of fraction digits for a given currency is NOT
+ * guaranteed to be constant across versions of ICU or CLDR. For example,
+ * do NOT use this value as a mechanism for deciding the magnitude used
+ * to store currency values in a database. You should use this value for
+ * display purposes only.
+ *
  * @param currency null-terminated 3-letter ISO 4217 code
  * @param usage enum usage for the currency
  * @param ec input-output error code
diff --git a/icu4j/main/classes/core/src/com/ibm/icu/util/Currency.java b/icu4j/main/classes/core/src/com/ibm/icu/util/Currency.java
index 51bccd5..fe9db84 100644
--- a/icu4j/main/classes/core/src/com/ibm/icu/util/Currency.java
+++ b/icu4j/main/classes/core/src/com/ibm/icu/util/Currency.java
@@ -840,6 +840,13 @@
      * Returns the number of the number of fraction digits that should
      * be displayed for this currency.
      * This is equivalent to getDefaultFractionDigits(CurrencyUsage.STANDARD);
+     *
+     * Important: The number of fraction digits for a given currency is NOT
+     * guaranteed to be constant across versions of ICU or CLDR. For example,
+     * do NOT use this value as a mechanism for deciding the magnitude used
+     * to store currency values in a database. You should use this value for
+     * display purposes only.
+     *
      * @return a non-negative number of fraction digits to be
      * displayed
      * @stable ICU 2.2
@@ -851,6 +858,13 @@
     /**
      * Returns the number of the number of fraction digits that should
      * be displayed for this currency with Usage.
+     *
+     * Important: The number of fraction digits for a given currency is NOT
+     * guaranteed to be constant across versions of ICU or CLDR. For example,
+     * do NOT use this value as a mechanism for deciding the magnitude used
+     * to store currency values in a database. You should use this value for
+     * display purposes only.
+     *
      * @param Usage the usage of currency(Standard or Cash)
      * @return a non-negative number of fraction digits to be
      * displayed