diff --git a/bilby/gw/detector.py b/bilby/gw/detector.py
index 38cda74fe96d52d5d5c52aa49fc10c6d7c801bff..599f492462a458d2393c2f0b59ac84a71a7b41db 100644
--- a/bilby/gw/detector.py
+++ b/bilby/gw/detector.py
@@ -1304,7 +1304,7 @@ class Interferometer(object):
            `waveform_generator.frequency_domain_strain()`. If
            `waveform_generator` is also given, the injection_polarizations will
            be calculated directly and this argument can be ignored.
-        waveform_generator: bilby.gw.waveform_generator
+        waveform_generator: bilby.gw.waveform_generator.WaveformGenerator
             A WaveformGenerator instance using the source model to inject. If
             `injection_polarizations` is given, this will be ignored.
 
@@ -2158,7 +2158,7 @@ def get_interferometer_with_fake_noise_and_injection(
        `waveform_generator.frequency_domain_strain()`. If
        `waveform_generator` is also given, the injection_polarizations will
        be calculated directly and this argument can be ignored.
-    waveform_generator: bilby.gw.waveform_generator
+    waveform_generator: bilby.gw.waveform_generator.WaveformGenerator
         A WaveformGenerator instance using the source model to inject. If
         `injection_polarizations` is given, this will be ignored.
     sampling_frequency: float