Editorial Manual 

The entry "schooldays" was added (the period in someone's life when they attended school) and the entry "schoolday"  was changed to "*school day"(a day on which classes are held in a primary or secondary school)

• The titles of books, publications, CD-ROMs, periodicals, newspapers, films, plays, radio and television programmes, podcast series and works of art

Court cases were added to titles that are capitalized: 
All words in the titles of books, periodicals, publications and court cases except articles, conjunctions and prepositions

The following guidance was added:

The use of the slash (/) is discouraged since its meaning is unclear. Usually it can be replaced by “and” or “or”. The term “and/or” should not be used as a replacement.

The following note was added under Verb tenses, present to past tense:

However, in summary records, the verb is always changed from the present to the past:

The speaker noted that, under the Universal Declaration of Human Rights, everyone had the right to life, liberty and security of person.

The following guidance has been added under Points of style, General instructions on footnotes and text notes:

Use of "e.g." and "i.e."
The phrases "for example" and "that is" (or "namely") are not abbreviated to  "e.g." or "i.e." in sentences, including in the running text of footnotes. The abbreviations may be used, without a comma after them, if they are enclosed within parentheses.

Following the adoption of the online Oxford Dictionary as the authority for spelling in United Nations documents, the following entries have been updated:

Baath party to Baath Party
charge-back to chargeback
law-making to lawmaking
mid-season to midseason
mid-size to midsize
pre-modern to premodern
pre-screen to prescreen
pre-register to preregister
roll-back (v) to rollback
white-list to whitelist

CSTO: Collective Security Treaty Organization

UNICRI: United Nations Interregional Crime and Justice Research Institute 

The following example was added under Ordinals: 

The candidate was ranked eighty-third out of 189 applicants.

• The definite article al is capitalized when it is the first element in a name (including after Mr. or Ms. or other title) and lower-case when it is in the middle; for example Al-Jazeera, Al-Qaida, Mohammed al-Ansari, Mr. Al-Ansari. The same practice applies to el, where used. 

References to audiovisual material and other multimedia content include the following elements: 
          1.  Author or organization responsible for the material 
          2. Title (in quotation marks) 
          3. Series title (if relevant)
          4.  Format 
          5.  Date posted or last updated, if indicated 
          6.  Location of citation (in hh:mm:ss format; optional) 
          7.  "Available at" URL (should be omitted if the reference is easily located through a web search) 
          8.  Date accessed (in parentheses), if no date is indicated on the material (optional) 

Examples: 
¹ BBC, "Iran nuclear deal 'must be preserved'", video, 3 May 2018. 
² United Nations, "Keeping the peace", UNcomplicated, podcast, 13 February 2020. 

The entry on italics was updated to read:
The titles of books, United Nations publications, CD-ROMs, periodicals, newspapers, films, plays, radio and television programmes, podcast series and works of art

The entries "digitalize (adapt a system or process)" and "digitize (convert material into a digital format)" were added

The example using an en dash to link to numbers was updated as follows: 

An en dash (–): A substantial increase in production (12–14 per cent) is expected. For more examples of the use of the en dash, see Punctuation.

Indigenous should be capitalized when referring to cultures, communities, lands, languages, etc., of Indigenous Peoples, e.g.: Indigenous culture in Ecuador, Indigenous languages are dying out. If referring to flora or fauna, lower case should be used.

When they are used, abbreviations and acronyms should always be explained. The name or title should be written out in full the first time it occurs in the main body of a document, followed by the abbreviation in parentheses. Thereafter, the abbreviation may be used in footnotes, figures, tables and boxes. If an abbreviation or acronym first appears in a footnote, figure, table or box, it should be written out in full again the first time it is used in the main body of the document.

Alternatively, if a document contains numerous abbreviations and acronyms, a list may be included after the table of contents or at the end of the document if there is no table of contents. A list of abbreviations and acronyms applies to the main document and to any annexes or attachments to it.

The following updates were made to the entry on Corrigenda and reissues (new language in bold):

Drafting: If a correction consists of a complete sentence phrased like an instruction (i.e. does not contain text for deletion or insertion), normal punctuation is used.

Example: The title of document A/60/496 should read as above. 
(See also the examples under Corrigendum to withdraw a document or correct a symbol and Corrigendum to replace a table and those for the corner notation and the title under Corrigendum to correct original language, corner notation or title, below.)

Corrigendum to correct original language, corner notation or title: When a corrigendum is issued to correct the agenda items or any other element in the corner notation, or to correct the title or subtitle (see models 7 and 8), the corrigendum is prepared with the correct information, and the text is phrased like an instruction

Under "Organization" the following was added "but organizational even if in reference to the Organization"

east, eastern
in reference to a geographical direction or an area within a country or a body of water (e.g., the eastern Mediterranean)
but East, Eastern in reference to a major region or in a political context: East Africa, East-West dialogue, the East Atlantic

north, northern
in reference to a geographical direction or an area within a country or a body of water (e.g., the northern Atlantic)
but North, Northern in reference to a major region or in a political context: North America, North-South dialogue, the North Atlantic

south, southern
in reference to a geographical direction or an area within a country or a body of water
but South, Southern in reference to a major region or in a political context: South-Eastern Europe, North-South dialogue, the South Pacific, the Southern Ocean (also known as the Antarctic Ocean)

west, western
in reference to a geographical direction or an area within a country or a body of water (e.g., the western Mediterranean)
but West, Western in reference to a major region or in a political context: West Africa, the Western Powers, the West Atlantic, the West Pacific

central in reference to an area within a country or a body of water (e.g., the central Mediterranean)
but Central in reference to a major region: Central Africa

The guidance on Repeated references was updated to read:
A reference is given the first time that a source or item is mentioned in the text. In resolutions, a reference is given once only, the first time that an item is mentioned, whether in the preamble or in the operative part. Once a reference has been given, it is repeated only when necessary for the sake of clarity or to change a specific element in the reference, such as a section or paragraph number.

A. Repeated footnote references
In a change from past practice, numbered footnote indicators are no longer repeated in resolutions. When a reference must be repeated, a new footnote with the identical text should be inserted.

Repeated footnote indicators may be used in explanatory footnotes.

The last two sentences on the guidance on Excessive referencing were updated to read:
II. General instructions on footnotes and text notes

C. Excessive referencing

In resolutions, an item is referenced once only, the first time that it is mentioned, whether in the preamble or the operative part. When it is necessary to repeat a reference, a new footnote should be inserted.

Change in guidance on text notes and footnotes:
II. General instructions on footnotes and text notes
Footnotes, text notes or references directly in the text. In masthead documents, sales publications and reports issued as supplements to the Official Records, references to masthead documents, including summary records or verbatim records, supplements, newspaper articles, public statements, interviews, personal communications and material on a website may be given in footnotes, text notes or directly in the text, as appropriate.

III.United Nations sources
B. Reports issued as supplements to the Official Records
Elements in the reference
In documents and publications, supplements may be cited by giving the document symbol in either a text note or a footnote after the descriptive title of the report.

The entry on commas was updated as follows:
Commas in pairs

          When a non-restrictive relative clause comes in the middle of a sentence, it is marked off by a comma at each end. It is also important to use commas in pairs in other parenthetical constructions:

          Not "In article 4, paragraph 6 (a) of the Convention..."

          But "In article 4, paragraph 6 (a), of the Convention..." [Note too that, in English, brackets are used in pairs "(a)", even where a single closing bracket is used in another language "a)".]

          Not "The court, while preserving its independence should perform..."

          But " The court, while preserving its independence, should perform..."

          Not "... submit to the Committee for its information, a report on..."

          But "... submit to the Committee, for its information, a report on..."

          Not "At its 42nd meeting on 18 January 1996, the Committee had decided..."

          But "At its 42nd meeting, on 18 January 1996, the Committee had decided..."

The guidance on attachments was updated to read:
The order of attachments is as follows: annex, enclosure, attachment. The heading “Enclosure” should be used for material that is separate from but attached to an annex; the heading “Attachment” is used for material that is separate from but attached to an enclosure. The heading “Appendix” should generally be avoided.

Roman numerals are used for multiple annexes, enclosures and attachments

The following entries were added:

crowdwork, crowdworker, crowdworking

The following entries were added:

lump-sum (adj.)
lump sum (noun)

Under the section “Ordinals”, the entry on latitude was updated to read:

Latitude and longitude: 32nd parallel, N 36°25'13, W 44°23'01”

The second paragraph was updated to read:

The country name is normally given after the name of a city, unless the city is the capital or the host city of a United Nations headquarters (e.g., Geneva and New York).