diff --git a/.travis.yml b/.travis.yml
index 6f2f367..a551d10 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -49,10 +49,9 @@ script:
 script:
  - raco test -p scope-operations
  - raco setup --check-pkg-deps --no-zo --no-launcher --no-install --no-post-install --no-docs --pkgs scope-operations
- #- raco pkg install --deps search-auto doc-coverage
- #- if $RACKET_VERSION != "6.5" -a $RACKET_VERSION != "6.6"; then raco doc-coverage scope-operations; fi
- #- raco doc-coverage scope-operations
+ - raco pkg install --deps search-auto doc-coverage
+ - raco doc-coverage scope-operations
+ - raco pkg install --deps search-auto cover cover-codecov
+ - raco cover -b -f codecov -d $TRAVIS_BUILD_DIR/coverage .
 
 after_success:
- - raco pkg install --deps search-auto cover cover-coveralls
- - raco cover -b -f coveralls -d $TRAVIS_BUILD_DIR/coverage .
diff --git a/scribblings/scope-operations.scrbl b/scribblings/scope-operations.scrbl
index c95fda2..179c359 100644
--- a/scribblings/scope-operations.scrbl
+++ b/scribblings/scope-operations.scrbl
@@ -71,11 +71,11 @@
          scopes/c]{Set intersection of the given sets of scopes.}
 
 
-@defproc[(single-scopes? [sc (or/c syntax? scopes/c)]) boolean?]{
+@defproc[(single-scope? [sc (or/c syntax? scopes/c)]) boolean?]{
  Predicate which returns @racket[#true] iff the given set of scopes contains
  only a single scope.}
 
-@defproc[(zero-scope? [sc (or/c syntax? scopes/c)]) boolean?]{
+@defproc[(zero-scopes? [sc (or/c syntax? scopes/c)]) boolean?]{
  Predicate which returns @racket[#true] iff the given set of scopes contains
  no scopes (e.g. because sc has been created with
  @racket[(datum->syntax #f 'id)]).}