diff --git a/core/forms.py b/core/forms.py
index ccdd307..c88a95f 100644
--- a/core/forms.py
+++ b/core/forms.py
@@ -215,12 +215,12 @@ class EntranceForm(ModelForm):
     tag_station = forms.CharField(
         required=False,
         widget=forms.TextInput(attrs={"size": "50","placeholder": "e.g. 1623.t2035-zb-03a"}), 
-        label="Tag station: Survex station id, e.g. 1623.p2023-aa-01"
+        label="Tag station: Survex station id, e.g. 1623.p2023-aa-01 (must be lower case)"
     )
     other_station = forms.CharField(
         required=False,
         widget=forms.TextInput(attrs={"size": "50","placeholder": "e.g. 1623.p2035-zb-03c"}), 
-        label="Other station: Survex station id, e.g. 1623.gps2018-aa-01"
+        label="Other station: Survex station id, e.g. 1623.gps2018-aa-01 (must be lower case)"
     )
 
     lat_wgs84 = forms.CharField(