diff --git a/README.rst b/README.rst
index 60a9e9b7f..7e9571660 100644
--- a/README.rst
+++ b/README.rst
@@ -114,7 +114,7 @@ Now, run ``pip-compile requirements.in``:
     #    pip-compile requirements.in
     #
     asgiref==3.2.3            # via django
-    django==3.0.3             # via -r requirements.in (line 1)
+    django==3.0.3             # via -r requirements.in
     pytz==2019.3              # via django
     sqlparse==0.3.0           # via django
 
@@ -146,7 +146,7 @@ version 8.0, ``pip-compile`` offers ``--generate-hashes`` flag:
     django==3.0.3 \
         --hash=sha256:2f1ba1db8648484dd5c238fb62504777b7ad090c81c5f1fd8d5eb5ec21b5f283 \
         --hash=sha256:c91c91a7ad6ef67a874a4f76f58ba534f9208412692a840e1d125eb5c279cb0a \
-        # via -r requirements.in (line 1)
+        # via -r requirements.in
     pytz==2019.3 \
         --hash=sha256:1c557d7d0e871de1f5ccd5833f60fb2550652da6be2693c1e02300743d21500d \
         --hash=sha256:b02c06db6cf09c12dd25137e563b31700d3b80fcc4ad23abb7a315f2789819be \
@@ -221,7 +221,7 @@ generated at the top of requirements files by setting the
     #    ./pipcompilewrapper
     #
     asgiref==3.2.3            # via django
-    django==3.0.3             # via -r requirements.in (line 1)
+    django==3.0.3             # via -r requirements.in
     pytz==2019.3              # via django
     sqlparse==0.3.0           # via django
 
@@ -262,7 +262,7 @@ First, compile ``requirements.txt`` as usual:
     #
     #    pip-compile
     #
-    django==2.1.15            # via -r requirements.in (line 1)
+    django==2.1.15            # via -r requirements.in
     pytz==2019.3              # via django
 
 
@@ -278,9 +278,9 @@ a constraint:
     #
     #    pip-compile dev-requirements.in
     #
-    django-debug-toolbar==2.2  # via -r dev-requirements.in (line 2)
-    django==2.1.15            # via -c requirements.txt (line 7), django-debug-toolbar
-    pytz==2019.3              # via -c requirements.txt (line 8), django
+    django-debug-toolbar==2.2  # via -r dev-requirements.in
+    django==2.1.15            # via -c requirements.txt, django-debug-toolbar
+    pytz==2019.3              # via -c requirements.txt, django
     sqlparse==0.3.0           # via django-debug-toolbar
 
 As you can see above, even though a ``2.2`` release of Django is available, the
diff --git a/piptools/writer.py b/piptools/writer.py
index 8269dffa3..d62b3f25e 100644
--- a/piptools/writer.py
+++ b/piptools/writer.py
@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 import os
+import re
 from itertools import chain
 
 import six
@@ -38,9 +39,12 @@
 )
 
 
+strip_comes_from_line_re = re.compile(r" \(line \d+\)$")
+
+
 def _comes_from_as_string(ireq):
     if isinstance(ireq.comes_from, six.string_types):
-        return ireq.comes_from
+        return strip_comes_from_line_re.sub("", ireq.comes_from)
     return key_from_ireq(ireq.comes_from)
 
 
diff --git a/tests/test_cli_compile.py b/tests/test_cli_compile.py
index 1ba2c647d..ea6421346 100644
--- a/tests/test_cli_compile.py
+++ b/tests/test_cli_compile.py
@@ -662,7 +662,7 @@ def test_multiple_input_files_without_output_file(runner):
         (
             "--annotate",
             "small-fake-a==0.1         "
-            "# via -c constraints.txt (line 1), small-fake-with-deps\n",
+            "# via -c constraints.txt, small-fake-with-deps\n",
         ),
         ("--no-annotate", "small-fake-a==0.1\n"),
     ],