diff --git a/ogr/ogr_feature.h b/ogr/ogr_feature.h
index 70e1b38c51b1..764700079ca4 100644
--- a/ogr/ogr_feature.h
+++ b/ogr/ogr_feature.h
@@ -196,7 +196,10 @@ class CPL_DLL OGRFieldDefn
     }
 
     /**
-     * @brief IsGenerated
+     * @brief Return whether the field is a generated field.
+     *
+     * At time of writing, only the GeoPackage and PG drivers fill that information. Consequently,
+     * only a returned value equal to TRUE can be fully trusted.
      * @return TRUE if the field is a generated field, FALSE otherwise.
      * @since GDAL 3.11
      */
diff --git a/ogr/ogrfeature.cpp b/ogr/ogrfeature.cpp
index 8f2d8015b4ae..170394a9a203 100644
--- a/ogr/ogrfeature.cpp
+++ b/ogr/ogrfeature.cpp
@@ -1597,6 +1597,9 @@ int OGRFeature::IsFieldSet(int iField) const
 /**
  * \brief Test if a field is a generated field.
  *
+ * At time of writing, only the GeoPackage and PG drivers fill that information. Consequently,
+ * only a returned value equal to TRUE can be fully trusted.
+ *
  * This method is the same as the C function OGR_F_IsFieldGenerated().
  *
  * @param iField the field to test.
@@ -1620,6 +1623,8 @@ bool OGRFeature::IsFieldGenerated(int iField) const
 /**
  * \brief Test if a field is a generated field.
  *
+ * At time of writing, only the GeoPackage driver fills that information. Consequently,
+ * only a returned value equal to TRUE can be fully trusted.
  * This function is the same as the C++ method OGRFeature::IsFieldGenerated().
  *
  * @param hFeat handle to the feature on which the field is.