diff --git a/pytec/pytec/gui/view/param_tree.json b/pytec/pytec/gui/view/param_tree.json
index ee230fc..4635a45 100644
--- a/pytec/pytec/gui/view/param_tree.json
+++ b/pytec/pytec/gui/view/param_tree.json
@@ -273,7 +273,7 @@
                   "27 SPS": 27.0,
                   "Off": null
                },
-               "tip": "Adjust the output data rate of the enhanced 50 Hz & 60 Hz rejection filter\n(Helps avoid mains interference)",
+               "tip": "Adjust the output data rate (in samples per second) of the enhanced 50 Hz & 60 Hz rejection filter\n(Helps avoid mains interference)",
                "lock": false
             }
          ]