Updated README.

Author: 5cript

README.md

@@ -315,7 +315,18 @@ Returns a past the end const_iterator in reverse.
 **Returns**: past the end const_iterator.
 
 ## Members of Interval
-___You can implement your own interval if you provide all the same functions.___
+___You can implement your own interval if you provide the same functions, except (within, operator-, size, operator!=).___
+
+There are 6 types of intervals:
+- open: (a, b)
+- left_open: (a, b]
+- right_open: [a, b)
+- closed: [a, b]
+- closed_adjacent: [a, b] (counts adjacent intervals as overlapping)
+- dynamic: Can be any of the above, depending on the input.
+
+Which can be picked with the second template parameter of interval:
+`lib_interval_tree::interval<int, lib_interval_tree::open>`
 
   - [Members of Interval](#members-of-interval)
     - [using value_type](#using-value_type)
@@ -324,7 +335,7 @@ ___You can implement your own interval if you provide all the same functions.___
     - [friend bool operator!=(interval const& lhs, interval const& other)](#friend-bool-operatorinterval-const-lhs-interval-const-other-1)
     - [value_type low() const](#value_type-low-const)
     - [value_type high() const](#value_type-high-const)
-    - [bool overlaps(value_type l, value_type h) const](#bool-overlapsvalue_type-l-value_type-h-const)
+    - [\[\[deprecated\]\] bool overlaps(value_type l, value_type h) const](#bool-overlapsvalue_type-l-value_type-h-const)
     - [bool overlaps_exclusive(value_type l, value_type h) const](#bool-overlaps_exclusivevalue_type-l-value_type-h-const)
     - [bool overlaps(interval const& other) const](#bool-overlapsinterval-const-other-const)
     - [bool overlaps_exclusive(interval const& other) const](#bool-overlaps_exclusiveinterval-const-other-const)
@@ -346,22 +357,23 @@ Comparison operator.
 Lower bound.
 ### value_type high() const
 Upper bound.
-### bool overlaps(value_type l, value_type h) const
+### \[\[deprecated\]\] bool overlaps(value_type l, value_type h) const
 Overlap these bounds with this interval (closed)?
+Is deprecated because the overlapping only works with closed intervals.
 ### bool overlaps_exclusive(value_type l, value_type h) const
 Overlap these bounds with this interval excluding borders?
 ### bool overlaps(interval const& other) const
 Like overlaps with lower and upper bound.
 ### bool overlaps_exclusive(interval const& other) const
 Like overlaps with lower and upper bound.
 ### bool within(value_type value) const
-Is the value within the interval (closed)?
+Is the value within the interval?
 ### bool within(interval const& other) const
 Is the interval within the interval?
 ### value_type operator-(interval const& other) const
 Calculates the distance between the two intervals.
 Overlapping intervals have 0 distance.
 ### value_type size() const
-Returns high - low.
+Returns The amount of elements in the interval when integral, or the distance between the 2 bounds when floating point.
 ### interval join(interval const& other) const
 Joins 2 intervals and whatever is inbetween.