diff --git a/src/spikeinterface/extractors/mdaextractors.py b/src/spikeinterface/extractors/mdaextractors.py
index 5f3faca477..abdbff38e7 100644
--- a/src/spikeinterface/extractors/mdaextractors.py
+++ b/src/spikeinterface/extractors/mdaextractors.py
@@ -89,7 +89,7 @@ def write_recording(
             Sampling frequency is appended to this dictionary.
         raw_fname: str
             File name of raw file. Defaults to 'raw.mda'.
-        params_fname: str, default 'params.json'
+        params_fname: str, default: 'params.json'
             File name of params file. Defaults to 'params.json'.
         geom_fname: str, default 'geom.csv'
             File name of geom file. Defaults to 'geom.csv'.