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Rule "possessive apostrophe for noun ending with 'x'"

This is one of many errors that LanguageTool can detect.

Description: possessive apostrophe for noun ending with 'x'
Message: Nouns ending with 'x' require a possessive 's' after the apostrophe.
Category: Grammar (ID: GRAMMAR)
Incorrect sentences
that this rule can detect:
  • The fox' tail is red.
    Correction suggestion: fox's
  • The toolbox' new functionality is great.
    Correction suggestion: toolbox's
  • Alex’ mother lapsed into a coma not long before the fall of the Berlin Wall.
    Correction suggestion: Alex’s
ID: NOUN_ENDING_WITH_X_POSSESSIVE_APOSTROPHE [1]
Version: 6.8-SNAPSHOT (2025-11-01 22:33:07 +0100)