diff --git a/components/decimal/README.md b/components/decimal/README.md
index 76ce034c677..61e377e3670 100644
--- a/components/decimal/README.md
+++ b/components/decimal/README.md
@@ -52,7 +52,7 @@ let fixed_decimal = {
 assert_writeable_eq!(fdf.format(&fixed_decimal), "2,000.50");
 ```
 
-#### Format a number using an alternative numbering system
+### Format a number using an alternative numbering system
 
 Numbering systems specified in the `-u-nu` subtag will be followed.
 
@@ -73,69 +73,6 @@ let fixed_decimal = SignedFixedDecimal::from(1000007);
 assert_writeable_eq!(fdf.format(&fixed_decimal), "๑,๐๐๐,๐๐๗");
 ```
 
-#### Get the resolved numbering system
-
-Inspect the data request to get the resolved numbering system (public but unstable):
-
-```rust
-use icu_provider::prelude::*;
-use icu::decimal::FixedDecimalFormatter;
-use icu::decimal::provider::DecimalDigitsV1Marker;
-use icu::locale::locale;
-use std::any::TypeId;
-use std::cell::RefCell;
-
-struct NumberingSystemInspectionProvider<P> {
-    inner: P,
-    numbering_system: RefCell<Option<Box<DataMarkerAttributes>>>,
-}
-
-impl<M, P> DataProvider<M> for NumberingSystemInspectionProvider<P>
-where
-    M: DataMarker,
-    P: DataProvider<M>,
-{
-    fn load(&self, req: DataRequest) -> Result<DataResponse<M>, DataError> {
-        if TypeId::of::<M>() == TypeId::of::<DecimalDigitsV1Marker>() {
-            *self.numbering_system.try_borrow_mut().unwrap() = Some(req.id.marker_attributes.to_owned());
-        }
-        self.inner.load(req)
-    }
-}
-
-let provider = NumberingSystemInspectionProvider {
-    inner: icu::decimal::provider::Baked,
-    numbering_system: RefCell::new(None),
-};
-
-let fdf = FixedDecimalFormatter::try_new_unstable(
-    &provider,
-    locale!("th").into(),
-    Default::default(),
-)
-.unwrap();
-
-assert_eq!(provider.numbering_system.borrow().as_ref().map(|x| x.as_str()), Some("latn"));
-
-let fdf = FixedDecimalFormatter::try_new_unstable(
-    &provider,
-    locale!("th-u-nu-thai").into(),
-    Default::default(),
-)
-.unwrap();
-
-assert_eq!(provider.numbering_system.borrow().as_ref().map(|x| x.as_str()), Some("thai"));
-
-let fdf = FixedDecimalFormatter::try_new_unstable(
-    &provider,
-    locale!("th-u-nu-adlm").into(),
-    Default::default(),
-)
-.unwrap();
-
-assert_eq!(provider.numbering_system.borrow().as_ref().map(|x| x.as_str()), Some("adlm"));
-```
-
 [`FixedDecimalFormatter`]: FixedDecimalFormatter
 
 <!-- cargo-rdme end -->