diff --git a/.github/actions/spelling/line_forbidden.patterns b/.github/actions/spelling/line_forbidden.patterns
index d8066ef..55ef685 100644
--- a/.github/actions/spelling/line_forbidden.patterns
+++ b/.github/actions/spelling/line_forbidden.patterns
@@ -125,6 +125,9 @@
 # Should probably be a person named `Nick` or the abbreviation `NIC`
 \bNic\b
 
+# Should be `not supposed`
+\bsupposed not\b
+
 # Should probably be `much more`
 \bmore much\b