diff --git a/serde_derive/src/internals/ast.rs b/serde_derive/src/internals/ast.rs
index 305d5f06..bb2c4690 100644
--- a/serde_derive/src/internals/ast.rs
+++ b/serde_derive/src/internals/ast.rs
@@ -6,7 +6,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! A serde ast, parsed from the syn ast and ready for codegen.
+//! A serde ast, parsed from the syn ast and ready to generate rust code.
 
 use internals::attr;
 use internals::check;
@@ -14,7 +14,7 @@ use internals::{Ctxt, Derive};
 use syn;
 use syn::punctuated::Punctuated;
 
-/// A source data structure annotated with `#[derive(Derialize)]` and/or `#[derive(Deserialize)]`,
+/// A source data structure annotated with `#[derive(Serialize)]` and/or `#[derive(Deserialize)]`,
 /// parsed into an internal representation.
 pub struct Container<'a> {
     /// The struct or enum name (without generics).
@@ -43,7 +43,7 @@ pub struct Variant<'a> {
     pub fields: Vec<Field<'a>>,
 }
 
-/// A variant of a struct.
+/// A field of a struct.
 pub struct Field<'a> {
     pub member: syn::Member,
     pub attrs: attr::Field,
diff --git a/serde_derive/src/internals/case.rs b/serde_derive/src/internals/case.rs
index e5162ca9..87428144 100644
--- a/serde_derive/src/internals/case.rs
+++ b/serde_derive/src/internals/case.rs
@@ -6,8 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Stuff to handle where the case of the source (e.g. `my-field`) is different to the
-//! field/variant (e.g. `my_field`).
+//! Utility code to assist converting the case of the source (e.g. `my-field`, `MY_FIELD`) to the
+//! rust-styled field/variant (e.g. `my_field`, `MyType`).
 
 // See https://users.rust-lang.org/t/psa-dealing-with-warning-unused-import-std-ascii-asciiext-in-today-s-nightly/13726
 #[allow(deprecated, unused_imports)]
diff --git a/serde_derive/src/internals/ctxt.rs b/serde_derive/src/internals/ctxt.rs
index 5aa6bbdb..51c72f7c 100644
--- a/serde_derive/src/internals/ctxt.rs
+++ b/serde_derive/src/internals/ctxt.rs
@@ -23,14 +23,16 @@ pub struct Ctxt {
 }
 
 impl Ctxt {
-    /// Create a new context object
+    /// Create a new context object.
+    ///
+    /// This object contains no errors, but will still trigger a panic if it is not `check`ed.
     pub fn new() -> Self {
         Ctxt {
             errors: RefCell::new(Some(Vec::new())),
         }
     }
 
-    /// Add an error to the context object
+    /// Add an error to the context object.
     pub fn error<T: Display>(&self, msg: T) {
         self.errors
             .borrow_mut()