diff --git a/basis/alien/c-types/c-types-docs.factor b/basis/alien/c-types/c-types-docs.factor
index e14a5cb5e1..dc1754a149 100644
--- a/basis/alien/c-types/c-types-docs.factor
+++ b/basis/alien/c-types/c-types-docs.factor
@@ -21,7 +21,7 @@ HELP: <c-type>
 HELP: no-c-type
 { $values { "name" c-type-name } }
 { $description "Throws a " { $link no-c-type } " error." }
-{ $error-description "Thrown by " { $link c-type } " if a given string does not name a C type. When thrown during compile time, indicates a typo in an " { $link alien-invoke } " or " { $link alien-callback } " form." } ;
+{ $error-description "Thrown by " { $link c-type } " if a given word is not a C type." } ;
 
 HELP: c-type
 { $values { "name" c-type-name } { "c-type" c-type } }
diff --git a/basis/alien/c-types/c-types.factor b/basis/alien/c-types/c-types.factor
index 19103ce3a8..48f608037b 100644
--- a/basis/alien/c-types/c-types.factor
+++ b/basis/alien/c-types/c-types.factor
@@ -3,7 +3,7 @@
 USING: accessors alien alien.accessors arrays byte-arrays
 classes combinators compiler.units cpu.architecture delegate
 fry kernel layouts locals macros math math.order quotations
-sequences system words words.symbol ;
+sequences system words words.symbol summary ;
 QUALIFIED: math
 IN: alien.c-types
 
@@ -37,7 +37,9 @@ unboxer
 : <c-type> ( -- c-type )
     \ c-type new ; inline
 
-ERROR: no-c-type name ;
+ERROR: no-c-type word ;
+
+M: no-c-type summary drop "Not a C type" ;
 
 ! C type protocol
 GENERIC: c-type ( name -- c-type ) foldable
diff --git a/core/io/io-docs.factor b/core/io/io-docs.factor
index 86f27f5186..ef64896dfb 100644
--- a/core/io/io-docs.factor
+++ b/core/io/io-docs.factor
@@ -245,11 +245,11 @@ HELP: lines
 { $description "Reads lines of text until from the " { $link input-stream } " until it is exhausted, collecting them in a sequence of strings." } ;
 
 HELP: each-line
-{ $values { "quot" { $quotation "( str -- )" } } }
+{ $values { "quot" { $quotation "( ... line -- ... )" } } }
 { $description "Calls the quotation with successive lines of text, until the current " { $link input-stream } " is exhausted." } ;
 
 HELP: each-block
-{ $values { "quot" { $quotation "( block -- )" } } }
+{ $values { "quot" { $quotation "( ... block -- ... )" } } }
 { $description "Calls the quotation with successive blocks of data, until the current " { $link input-stream } " is exhausted." } ;
 
 HELP: stream-contents