diff --git a/iris/algebra/coPset.v b/iris/algebra/coPset.v
index 7a987611969ff5c97ec822e6505304d4e6018af7..aba562c4299d79cca7e497d2139982c0d1870456 100644
--- a/iris/algebra/coPset.v
+++ b/iris/algebra/coPset.v
@@ -60,7 +60,7 @@ Section coPset.
   Qed.
 End coPset.
 
-(* The disjoiny union CMRA *)
+(* The disjoint union CMRA *)
 Inductive coPset_disj :=
   | CoPset : coPset → coPset_disj
   | CoPsetBot : coPset_disj.