diff --git a/corepos/db/office_op/model.py b/corepos/db/office_op/model.py
index 9ec20d2..7328525 100644
--- a/corepos/db/office_op/model.py
+++ b/corepos/db/office_op/model.py
@@ -1263,7 +1263,10 @@ class MemberInfo(Base):
 
     email = sa.Column('email_1', sa.String(length=50), nullable=True)
 
-    email2 = sa.Column('email_2', sa.String(length=50), nullable=True)
+    email2 = sa.Column('email_2', sa.String(length=50), nullable=True, doc="""
+    NB. this is labeled "Alt. Phone" in CORE Office member view, and
+    is named `altPhone` when dealing with CORE Office webservices API.
+    """)
 
     ads_ok = sa.Column('ads_OK', sa.Boolean(), nullable=True, default=True)