diff --git a/pipenv/cli.py b/pipenv/cli.py
index 12e5c622..7f048eeb 100644
--- a/pipenv/cli.py
+++ b/pipenv/cli.py
@@ -515,6 +515,10 @@ def which_pip(allow_global=False):
 
 def proper_case(package_name):
 
+    # Skip checking proper-case if it's already a good name.
+    if package_name in project.proper_names:
+        return package_name
+
     # Capture tag contents here.
     collected = []
 
@@ -535,7 +539,12 @@ def proper_case(package_name):
     parser.feed(r.text)
 
     r = parse.parse('Links for {name}', collected[1])
-    return r['name'].strip()
+    good_name = r['name'].strip()
+
+    # Register the good name for future reference.
+    project.register_proper_name(good_name)
+
+    return good_name
 
 
 def format_help(help):
diff --git a/pipenv/project.py b/pipenv/project.py
index 452e667f..c66d9a74 100644
--- a/pipenv/project.py
+++ b/pipenv/project.py
@@ -58,6 +58,25 @@ class Project(object):
 
         return d_dir
 
+    @property
+    def proper_names_location(self):
+        pn_file = os.sep.join(self.pipfile_location.split(os.sep)[:-1] + ['.venv', 'pipenev-proper-names.txt'])
+
+        # Create the database, if it doesn't exist.
+        open(pn_file, 'a').close()
+
+        return pn_file
+
+    @property
+    def proper_names(self):
+        with open(self.proper_names_location, 'r') as f:
+            return f.read().splitlines()
+
+    def register_proper_name(self, name):
+        """Registers a proper name to the database."""
+        with open(self.proper_names_location, 'a') as f:
+            f.write('{0}\n'.format(name))
+
     @property
     def pipfile_location(self):
         try: