diff --git a/CHANGELOG.md b/CHANGELOG.md
index 16c762f38..20b2e823f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@ The original MRs are only visible on the [LIGO GitLab repository](https://git.li
 
 ## [Unreleased]
 
+### Fixes
+* Corrected incorrect docstrings for `matched_filter_snr` and `optimal_snr_squared` in `bilby/gw/utils.py` (closes #731)
+
 ## [2.7.1]
 
 ### Fixes
diff --git a/bilby/gw/utils.py b/bilby/gw/utils.py
index f1f4c0291..420e1fc04 100644
--- a/bilby/gw/utils.py
+++ b/bilby/gw/utils.py
@@ -155,7 +155,7 @@ def matched_filter_snr(signal, frequency_domain_strain, power_spectral_density,
 
     Returns
     =======
-    float: The matched filter signal to noise ratio squared
+    complex: The complex matched filter signal to noise ratio
 
     """
     rho_mf = noise_weighted_inner_product(
@@ -184,7 +184,7 @@ def optimal_snr_squared(signal, power_spectral_density, duration):
 
     Returns
     =======
-    float: The matched filter signal to noise ratio squared
+    float: The square of the optimal matched filter signal to noise ratio
 
     """
     return noise_weighted_inner_product(signal, signal, power_spectral_density, duration)