diff --git a/src/de.rs b/src/de.rs
index 46c2b9e..7838f20 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -96,9 +96,7 @@ macro_rules! overflow {
     };
 }
 
-// Not public API. Should be pub(crate).
-#[doc(hidden)]
-pub enum ParserNumber {
+pub(crate) enum ParserNumber {
     F64(f64),
     U64(u64),
     I64(i64),
diff --git a/src/error.rs b/src/error.rs
index 3d2822b..06c2b09 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -175,9 +175,7 @@ struct ErrorImpl {
     column: usize,
 }
 
-// Not public API. Should be pub(crate).
-#[doc(hidden)]
-pub enum ErrorCode {
+pub(crate) enum ErrorCode {
     /// Catchall for syntax error messages
     Message(Box<str>),
 
@@ -252,10 +250,8 @@ pub enum ErrorCode {
 }
 
 impl Error {
-    // Not public API. Should be pub(crate).
-    #[doc(hidden)]
     #[cold]
-    pub fn syntax(code: ErrorCode, line: usize, column: usize) -> Self {
+    pub(crate) fn syntax(code: ErrorCode, line: usize, column: usize) -> Self {
         Error {
             err: Box::new(ErrorImpl {
                 code: code,
@@ -280,10 +276,8 @@ impl Error {
         }
     }
 
-    // Not public API. Should be pub(crate).
-    #[doc(hidden)]
     #[cold]
-    pub fn fix_position<F>(self, f: F) -> Self
+    pub(crate) fn fix_position<F>(self, f: F) -> Self
     where
         F: FnOnce(ErrorCode) -> Error,
     {
diff --git a/src/number.rs b/src/number.rs
index 97a0db0..cedd2bb 100644
--- a/src/number.rs
+++ b/src/number.rs
@@ -13,9 +13,7 @@ use crate::error::ErrorCode;
 use serde::de::{IntoDeserializer, MapAccess};
 
 #[cfg(feature = "arbitrary_precision")]
-/// Not public API. Should be pub(crate).
-#[doc(hidden)]
-pub const TOKEN: &str = "$serde_json::private::Number";
+pub(crate) const TOKEN: &str = "$serde_json::private::Number";
 
 /// Represents a JSON number, whether integer or floating point.
 #[derive(Clone, PartialEq)]
@@ -567,9 +565,7 @@ impl<'de, 'a> Deserializer<'de> for &'a Number {
 }
 
 #[cfg(feature = "arbitrary_precision")]
-// Not public API. Should be pub(crate).
-#[doc(hidden)]
-pub struct NumberDeserializer {
+pub(crate) struct NumberDeserializer {
     pub number: Option<String>,
 }
 
@@ -728,10 +724,8 @@ serde_if_integer128! {
 
 impl Number {
     #[cfg(not(feature = "arbitrary_precision"))]
-    // Not public API. Should be pub(crate).
-    #[doc(hidden)]
     #[cold]
-    pub fn unexpected(&self) -> Unexpected {
+    pub(crate) fn unexpected(&self) -> Unexpected {
         match self.n {
             N::PosInt(u) => Unexpected::Unsigned(u),
             N::NegInt(i) => Unexpected::Signed(i),
@@ -740,10 +734,8 @@ impl Number {
     }
 
     #[cfg(feature = "arbitrary_precision")]
-    // Not public API. Should be pub(crate).
-    #[doc(hidden)]
     #[cold]
-    pub fn unexpected(&self) -> Unexpected {
+    pub(crate) fn unexpected(&self) -> Unexpected {
         Unexpected::Other("number")
     }
 }
diff --git a/src/ser.rs b/src/ser.rs
index 630b4cc..1387e6c 100644
--- a/src/ser.rs
+++ b/src/ser.rs
@@ -506,16 +506,16 @@ where
     }
 }
 
-#[derive(Eq, PartialEq)]
-/// Not public API. Should be pub(crate).
+// Not public API. Should be pub(crate).
 #[doc(hidden)]
+#[derive(Eq, PartialEq)]
 pub enum State {
     Empty,
     First,
     Rest,
 }
 
-/// Not public API. Should be pub(crate).
+// Not public API. Should be pub(crate).
 #[doc(hidden)]
 pub enum Compound<'a, W: 'a, F: 'a> {
     Map {