diff --git a/mne/source_estimate.py b/mne/source_estimate.py
index a31373ed788..b2be0447384 100644
--- a/mne/source_estimate.py
+++ b/mne/source_estimate.py
@@ -1595,7 +1595,7 @@ def save_as_surface(self, fname, src, scale=1, scale_rr=1e3):
             for example ``"basename"`` will write ``"basename.lh.gii"``,
             ``"basename.lh.time.gii"``, ``"basename.rh.gii"``, and
             ``"basename.rh.time.gii"``.
-        src : source solution (surface) object
+        src : instance of SourceSpaces
             The source space of the forward solution.
         scale : int
             Scale of functional values.