diff --git a/pkgs/plai/scribblings/collector2.scrbl b/pkgs/plai/scribblings/collector2.scrbl
index 31b71141ef..c4a4fdd782 100644
--- a/pkgs/plai/scribblings/collector2.scrbl
+++ b/pkgs/plai/scribblings/collector2.scrbl
@@ -179,7 +179,7 @@ an error.
 @defproc[(gc:alloc-flat (val heap-value?)) location?]{
 
 This procedure should allocate a flat value (number, symbol, boolean,
-closure or empty list) on the heap, returning its location (a number). The
+or empty list) on the heap, returning its location (a number). The
 value should occupy a single heap cell, though you may use additional space to
 store a tag, etc. You are also welcome to pre-allocate common constants (e.g.,
 the empty list). This procedure may need to perform a garbage-collection. If