diff --git a/src/io.jl b/src/io.jl
index 68686eb..adce30a 100644
--- a/src/io.jl
+++ b/src/io.jl
@@ -74,6 +74,7 @@ function _lower(obj; geometrycolumn = first(GI.geometrycolumns(obj)))
         end
     elseif Tables.istable(obj)
         !(geometrycolumn isa Symbol) && throw(ArgumentError("GeoJSON.jl can only write a single geometry column which must be specified as a `Symbol`, but was passed `$(geometrycolumn)` instead."))
+        geometrycolumn != :geometry && @warn "GeoJSON specification requires the geometry column to be named 'geometry'. The column '$(geometrycolumn)' will be written as 'geometry' in the output."
         geom_col_idx = Tables.columnindex(obj, geometrycolumn)
         # There is a strange bug where Tables.columnnames on some tables is empty, 
         # so we use the schema instead
diff --git a/test/runtests.jl b/test/runtests.jl
index 36f58db..6eac346 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -399,6 +399,16 @@ include("geojson_samples.jl")
         @test t2_geojson.prop1 == getproperty.(t2, :prop1)
         @test t2_geojson.prop2 == getproperty.(t2, :prop2)
 
+        @testset "geometrycolumn warnings" begin
+            # Test warning is shown for non-geometry column
+            t_warn = [(somethingelse=(1.0, 2.0), prop1=1)]
+            @test_logs (:warn, r"GeoJSON specification requires.*geometry.*somethingelse.*") GeoJSON.write(t_warn; geometrycolumn = :somethingelse)
+            
+            # Test no warning for geometry column
+            t_no_warn = [(geometry=(1.0, 2.0), prop1=1)]
+            @test_logs GeoJSON.write(t_no_warn; geometrycolumn = :geometry)
+        end
+
         @testset "Metadata" begin
             @test GI.DataAPI.metadatasupport(typeof(t2_geojson)) == (; read = true, write = false)
             @test GI.DataAPI.metadatakeys(t2_geojson) == ("GEOINTERFACE:geometrycolumns", "GEOINTERFACE:crs")