diff --git a/raco.rkt b/raco.rkt
index 3e81501..3c346f3 100644
--- a/raco.rkt
+++ b/raco.rkt
@@ -39,8 +39,8 @@
       [("-e" "--exclude-from-output") t
        "exclude any paths named this from the coverage report."
        (set! exclude-paths (cons t exclude-paths))]
-      [("-i" "--include-extentions") f
-       "include these extentions in files to cover."
+      [("-i" "--include-extensions") f
+       "include these extensions in files to cover."
        (set! include-exts (cons f include-exts))]
       [("-s" "--submodule") s
        "Run the given submodule instead of the test submodule"
diff --git a/scribblings/api.scrbl b/scribblings/api.scrbl
index d5753ab..34c0334 100644
--- a/scribblings/api.scrbl
+++ b/scribblings/api.scrbl
@@ -11,7 +11,7 @@ functions of test coverage.
 
 @defproc[(test-files! (#:submod submod symbol? 'test) (files path-string?) ...) any/c]{
 
-Runs all given @racket[files] and there submodule @racket[submod] (if it exitsts),
+Runs all given @racket[files] and there submodule @racket[submod] (if it exists),
 storing the coverage information. Returns false if tests failed. Test coverage
 information is still collected when test fail. Test coverage info is added to
 existing coverage info.}
@@ -26,7 +26,7 @@ existing coverage info.}
          ]{
 Given some location in a file and the
 coverage information for that file @racket[make-covered?] returns
-a functions that determins if some @racket[1] indexed character or byte location
+a functions that determines if some @racket[1] indexed character or byte location
 in that file is covered. There are three possible results:
 @itemize[@item{@racket['missing] --- The location is not in the
 coverage information, is in a submodule, or lexes (in the sense of that languages
@@ -47,7 +47,7 @@ formats. Equivalent to the specifications of the @Flag{c} argument to
                          #:value (hash/c (and/c path-string? absolute-path?)
                                          file-coverage/c)]
                 @defthing[file-coverage/c contract? #:value (listof (list/c boolean? srcloc?))])]{
-Coverage infomation is a hash map mapping absolute
+Coverage information is a hash map mapping absolute
 file paths to a list detailing the coverage of that file. The coverage
 information is a list of lists, mapping a boolean to a range of
 characters within the file. True means the @racket[srcloc] structure
diff --git a/scribblings/basics.scrbl b/scribblings/basics.scrbl
index 1e2856d..8ca25dc 100644
--- a/scribblings/basics.scrbl
+++ b/scribblings/basics.scrbl
@@ -32,7 +32,7 @@ The @exec{raco cover} command accepts the following flags:
                outputted coverage. This flag may appear any number of times.}
          @item{@Flag{p} or @DFlag{exclude-pkg-defaults}
                Equivalent to @exec{-e tests -e info.rkt -e scribblings}}
-         @item{@Flag{i} or @DFlag{include-extentions}
+         @item{@Flag{i} or @DFlag{include-extensions}
                --- include the given regular expression in the list of file patterns
                    used when expanding directories, searching for files to cover.}
          @item{@Flag{v} or @DFlag{verbose}