diff --git a/vcr/core.py b/vcr/core.py
index 91d468d..02c6afe 100644
--- a/vcr/core.py
+++ b/vcr/core.py
@@ -623,7 +623,8 @@ def _vcr_inner(*args, **kwargs):
                     sha256 = get_source_code_sha256(func)
                     if sha256 != sha256_playlist:
                         msg = ('Source code of test routine has changed since '
-                               'time when VCR tape was recorded.')
+                               'time when VCR tape (file: {}) was '
+                               'recorded.').format(tape)
                         raise VCRPlaybackSourceCodeChangedError(msg)
                     if VCRSystem.debug:
                         print('SHA256 sum of source code matches playlist')