diff --git a/tupak/gw/detectors/CE.interferometer b/tupak/gw/detectors/CE.interferometer
index 65a93ae0d59ae870762f42fd185993ae4c8ec9ac..ee7f2ebae1874d295073fc8260e2dc143ad3167b 100644
--- a/tupak/gw/detectors/CE.interferometer
+++ b/tupak/gw/detectors/CE.interferometer
@@ -1,3 +1,6 @@
+# The proposed Cosmic Explorer located at the site of LIGO Hanford.
+# LIGO-T980044-10
+# https://dcc.ligo.org/LIGO-P1600143/public
 name = 'CE'
 power_spectral_density = PowerSpectralDensity(psd_file='CE_psd.txt')
 minimum_frequency = 10
diff --git a/tupak/gw/detectors/GEO600.interferometer b/tupak/gw/detectors/GEO600.interferometer
index 6042352f6ddf835e8e80dafdfe5f0cba0e0963f7..bf84d748c8dd88e121fbcb3a5c1aa1c0ddad83bd 100644
--- a/tupak/gw/detectors/GEO600.interferometer
+++ b/tupak/gw/detectors/GEO600.interferometer
@@ -1,3 +1,6 @@
+# GEO600 at the sensitivity during initial LIGO S6.
+# arXiv:gr-qc/0008066 Table 1
+# http://www.geo600.org/1032083/GEO600_Sensitivity_Curves
 name = 'GEO600'
 power_spectral_density = PowerSpectralDensity(asd_file='GEO600_S6e_asd.txt')
 minimum_frequency = 40
diff --git a/tupak/gw/detectors/H1.interferometer b/tupak/gw/detectors/H1.interferometer
index 75b25b31c9f1c2a98952306a86f064f536cf724f..7289cf0b900622e46d1f7f0b94101e7317083caa 100644
--- a/tupak/gw/detectors/H1.interferometer
+++ b/tupak/gw/detectors/H1.interferometer
@@ -1,3 +1,6 @@
+# Advanced LIGO Hanford at design sensitvity.
+# LIGO-T980044-10
+# https://dcc.ligo.org/LIGO-P1200087-v42/public
 name = 'H1'
 power_spectral_density = PowerSpectralDensity(psd_file='aLIGO_ZERO_DET_high_P_psd.txt')
 minimum_frequency = 20
diff --git a/tupak/gw/detectors/L1.interferometer b/tupak/gw/detectors/L1.interferometer
index 432a01432405c0534043679800c3be9869d79518..37ba88b383c524556f29179da688ca5c446d61ff 100644
--- a/tupak/gw/detectors/L1.interferometer
+++ b/tupak/gw/detectors/L1.interferometer
@@ -1,3 +1,6 @@
+# Advanced LIGO Livingston at design sensitvity.
+# LIGO-T980044-10
+# https://dcc.ligo.org/LIGO-P1200087-v42/public
 name = 'L1'
 power_spectral_density = PowerSpectralDensity(psd_file='aLIGO_ZERO_DET_high_P_psd.txt')
 minimum_frequency = 20
diff --git a/tupak/gw/detectors/V1.interferometer b/tupak/gw/detectors/V1.interferometer
index fe104aee08d2fa164ea7f5535e22eaedf1a76411..ea5fd361e50c8b3175bbd47f3356ded33fd4fa67 100644
--- a/tupak/gw/detectors/V1.interferometer
+++ b/tupak/gw/detectors/V1.interferometer
@@ -1,3 +1,6 @@
+# Advanced LIGO at design sensitvity.
+# arXiv:gr-qc/0008066 Table 1
+# https://dcc.ligo.org/LIGO-P1200087-v42/public
 name = 'V1'
 power_spectral_density = PowerSpectralDensity(psd_file='AdV_psd.txt')
 length = 3