diff --git a/basis/alien/c-types/c-types-docs.factor b/basis/alien/c-types/c-types-docs.factor
index 1ec9a82169..a2b555b057 100644
--- a/basis/alien/c-types/c-types-docs.factor
+++ b/basis/alien/c-types/c-types-docs.factor
@@ -105,12 +105,12 @@ HELP: unbox-return
 { $notes "This is an internal word used by the compiler when compiling callbacks." } ;
 
 HELP: define-deref
-{ $values { "name" "a word name" } { "vocab" "a vocabulary name" } }
+{ $values { "name" "a word name" } }
 { $description "Defines a word " { $snippet "*name" } " with stack effect " { $snippet "( c-ptr -- value )" } " for reading a value with C type " { $snippet "name" } " stored at an alien pointer." }
 { $notes "This is an internal word called when defining C types, there is no need to call it on your own." } ;
 
 HELP: define-out
-{ $values { "name" "a word name" } { "vocab" "a vocabulary name" } }
+{ $values { "name" "a word name" } }
 { $description "Defines a word " { $snippet "<" { $emphasis "name" } ">" } " with stack effect " { $snippet "( value -- array )" } ". This word allocates a byte array large enough to hold a value with C type " { $snippet "name" } ", and writes the value at the top of the stack to the array." }
 { $notes "This is an internal word called when defining C types, there is no need to call it on your own." } ;