diff --git a/sphinx/environment/__init__.py b/sphinx/environment/__init__.py
index 7be84ab29..52cf7fa95 100644
--- a/sphinx/environment/__init__.py
+++ b/sphinx/environment/__init__.py
@@ -390,7 +390,7 @@ class BuildEnvironment:
             exclude_paths = (self.config.exclude_patterns +
                              self.config.templates_path +
                              builder.get_asset_paths())
-            self.project.discovery(exclude_paths)
+            self.project.discover(exclude_paths)
 
             # Current implementation is applying translated messages in the reading
             # phase.Therefore, in order to apply the updated message catalog, it is
diff --git a/sphinx/project.py b/sphinx/project.py
index ed910088e..82ea54ef3 100644
--- a/sphinx/project.py
+++ b/sphinx/project.py
@@ -44,7 +44,7 @@ class Project(object):
         """Take over a result of last build."""
         self.docnames = other.docnames
 
-    def discovery(self, exclude_paths=[]):
+    def discover(self, exclude_paths=[]):
         # type: (List[unicode]) -> Set[unicode]
         """Find all document files in the source directory and put them in
         :attr:`docnames`.
diff --git a/tests/test_project.py b/tests/test_project.py
index 3b48c2de3..3ae00ef4e 100644
--- a/tests/test_project.py
+++ b/tests/test_project.py
@@ -16,7 +16,7 @@ import pytest
 from sphinx.project import Project
 
 
-def test_project_discovery(rootdir):
+def test_project_discover(rootdir):
     project = Project(rootdir / 'test-root', {})
 
     docnames = {'autodoc', 'bom', 'extapi', 'extensions', 'footnote', 'images',
@@ -26,29 +26,29 @@ def test_project_discovery(rootdir):
 
     # basic case
     project.source_suffix = ['.txt']
-    assert project.discovery() == docnames
+    assert project.discover() == docnames
 
     # exclude_paths option
-    assert project.discovery(['subdir/*']) == docnames - subdir_docnames
+    assert project.discover(['subdir/*']) == docnames - subdir_docnames
 
     # exclude_patterns
-    assert project.discovery(['.txt', 'subdir/*']) == docnames - subdir_docnames
+    assert project.discover(['.txt', 'subdir/*']) == docnames - subdir_docnames
 
     # multiple source_suffixes
     project.source_suffix = ['.txt', '.foo']
-    assert project.discovery() == docnames | {'otherext'}
+    assert project.discover() == docnames | {'otherext'}
 
     # complicated source_suffix
     project.source_suffix = ['.foo.png']
-    assert project.discovery() == {'img'}
+    assert project.discover() == {'img'}
 
     # templates_path
     project.source_suffix = ['.html']
-    assert project.discovery() == {'_templates/layout',
-                                   '_templates/customsb',
-                                   '_templates/contentssb'}
+    assert project.discover() == {'_templates/layout',
+                                  '_templates/customsb',
+                                  '_templates/contentssb'}
 
-    assert project.discovery(['_templates']) == set()
+    assert project.discover(['_templates']) == set()
 
 
 @pytest.mark.sphinx(testroot='basic')