diff --git a/docs/rules/no-irregular-whitespace.md b/docs/rules/no-irregular-whitespace.md
index 3545cd82839..eb366915ade 100644
--- a/docs/rules/no-irregular-whitespace.md
+++ b/docs/rules/no-irregular-whitespace.md
@@ -33,7 +33,7 @@ This rule disallows the following characters except where the options allow:
     \u2001 - Em Quad
     \u2002 - En Space - <ENSP>
     \u2003 - Em Space - <EMSP>
-    \u2004 - Tree-Per-Em
+    \u2004 - Three-Per-Em
     \u2005 - Four-Per-Em
     \u2006 - Six-Per-Em
     \u2007 - Figure Space