Insert entry into the article's ## History section, creating the section (just before ## See also / ## References, never after the references) when it is absent. Idempotent for an identical entry already present — never duplicates a line. Pure.
entry
## History
## See also
## References
Insert
entryinto the article's## Historysection, creating the section (just before## See also/## References, never after the references) when it is absent. Idempotent for an identical entry already present — never duplicates a line. Pure.