diff --git a/collects/scribblings/reference/cmdline.scrbl b/collects/scribblings/reference/cmdline.scrbl
index 6dc14fb86b..237c72a1bc 100644
--- a/collects/scribblings/reference/cmdline.scrbl
+++ b/collects/scribblings/reference/cmdline.scrbl
@@ -209,7 +209,7 @@ Example:
 
 @defproc[(parse-command-line [name (or/c string? path?)]
                              [argv (or/c (listof string?) (vectorof string?))]
-                             [table (listof (list/c symbol? list?))]
+                             [table (listof (cons/c symbol? list?))]
                              [finish-proc ((list?) () #:rest list? . ->* . any)]
                              [arg-help-strs (listof string?)]
                              [help-proc (string? . -> . any) (lambda (str) ....)]
@@ -257,7 +257,7 @@ string and exits and the default @scheme[unknown-proc] raises the
 @scheme[exn:fail] exception.
 
 A @scheme[table] is a list of flag specification sets. Each set is
-represented as a list of two items: a mode symbol and a list of either
+represented as a pair of two items: a mode symbol and a list of either
 help strings or flag specifications.  A mode symbol is one of
 @scheme['once-each], @scheme['once-any], @scheme['multi],
 @scheme['final], or @scheme['help-labels], with the same meanings as
diff --git a/collects/scribblings/reference/numbers.scrbl b/collects/scribblings/reference/numbers.scrbl
index 677c0adc63..ab4b086697 100644
--- a/collects/scribblings/reference/numbers.scrbl
+++ b/collects/scribblings/reference/numbers.scrbl
@@ -452,7 +452,8 @@ used.
 
 @defproc[(log [z number?]) number?]{ Returns the natural logarithm of
  @scheme[z].  The result is normally inexact, but it is
- @scheme[0] when @scheme[z] is an exact @scheme[1].
+ @scheme[0] when @scheme[z] is an exact @scheme[1]. When @scheme[z]
+ is exact @scheme[0], @exnraise[exn:fail:contract:divide-by-zero].}
 
 @mz-examples[(log (exp 1)) (log 2+3i) (log 1)]}