5 files changed, 12 insertions, 7 deletions
diff --git a/src/construct/gfm_label_start_footnote.rs b/src/construct/gfm_label_start_footnote.rs
index a3a0df6..c123bfc 100644
--- a/src/construct/gfm_label_start_footnote.rs
+++ b/src/construct/gfm_label_start_footnote.rs
@@ -20,8 +20,9 @@
 //!
 //! ## Tokens
 //!
-//! *   [`LabelImage`][Name::LabelImage]
-//! *   To do.
+//! *   [`GfmFootnoteCallLabel`][Name::GfmFootnoteCallLabel]
+//! *   [`GfmFootnoteCallMarker`][Name::GfmFootnoteCallMarker]
+//! *   [`LabelMarker`][Name::LabelMarker]
 //!
 //! ## References
 //!
diff --git a/src/construct/raw_flow.rs b/src/construct/raw_flow.rs
index 7eaac0c..395d0ae 100644
--- a/src/construct/raw_flow.rs
+++ b/src/construct/raw_flow.rs
@@ -143,7 +143,7 @@ use crate::event::{Content, Link, Name};
 use crate::state::{Name as StateName, State};
 use crate::tokenizer::Tokenizer;
 use crate::util::{
-    constant::{CODE_FENCED_SEQUENCE_SIZE_MIN, TAB_SIZE},
+    constant::{CODE_FENCED_SEQUENCE_SIZE_MIN, MATH_FLOW_SEQUENCE_SIZE_MIN, TAB_SIZE},
     slice::{Position, Slice},
 };
 
@@ -253,10 +253,9 @@ pub fn sequence_open(tokenizer: &mut Tokenizer) -> State {
         tokenizer.consume();
         State::Next(StateName::RawFlowSequenceOpen)
     }
-    // To do: constant.
     else if tokenizer.tokenize_state.size
         < (if tokenizer.tokenize_state.marker == b'$' {
-            2
+            MATH_FLOW_SEQUENCE_SIZE_MIN
         } else {
             CODE_FENCED_SEQUENCE_SIZE_MIN
         })
diff --git a/src/construct/raw_text.rs b/src/construct/raw_text.rs
index 1a4d03c..6a35608 100644
--- a/src/construct/raw_text.rs
+++ b/src/construct/raw_text.rs
@@ -112,7 +112,6 @@
 //! [text]: crate::construct::text
 //! [code_indented]: crate::construct::code_indented
 //! [raw_flow]: crate::construct::raw_flow
-//! [math_flow]: # "to do"
 //! [html_code]: https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-code-element
 
 use crate::event::Name;
diff --git a/src/event.rs b/src/event.rs
index fc7722d..458bd19 100644
--- a/src/event.rs
+++ b/src/event.rs
@@ -2807,7 +2807,6 @@ pub struct Point {
 impl Point {
     /// Create a new point, that is shifted from the close earlier current
     /// point, to `index.`
-    // To do: tabs.
     pub fn shift_to(&self, bytes: &[u8], index: usize) -> Point {
         let mut next = self.clone();
         debug_assert!(index > next.index, "expect");
diff --git a/src/util/constant.rs b/src/util/constant.rs
index d6a6651..a9a7895 100644
--- a/src/util/constant.rs
+++ b/src/util/constant.rs
@@ -248,6 +248,13 @@ pub const LINK_REFERENCE_SIZE_MAX: usize = 999;
 /// [list-item]: crate::construct::list_item
 pub const LIST_ITEM_VALUE_SIZE_MAX: usize = 10;
 
+/// The number of markers needed for [math (flow)][raw_flow] to form.
+///
+/// Unlike code (fenced), this number is `2`.
+///
+/// [raw_flow]: crate::construct::raw_flow
+pub const MATH_FLOW_SEQUENCE_SIZE_MIN: usize = 2;
+
 /// Maximum allowed unbalanced parens in destination.
 ///
 /// There can be many balanced parens, but if there are 33 opens that were not