diff --git a/gds_to_lef_gds_mag.py b/gds_to_lef_gds_mag.py
index 1d92c70..aaf4a9f 100755
--- a/gds_to_lef_gds_mag.py
+++ b/gds_to_lef_gds_mag.py
@@ -192,7 +192,25 @@
         if lef_file:
             assert os.path.exists(lef_file), lef_file
             print(f'lef read '+lef_file,   file=ofile)
-        print(f'load {escaped_cell}',      file=ofile)
+            # Complement missing annotations from the SkyWater LEF
+            print(f'load {escaped_cell}',      file=ofile)
+            print( 'if {![catch {set vpbpin [port VPB index]}]} {', file=ofile)
+            print( '    if {[port VPB use] == "default"} {', file=ofile)
+            print( '        port VPB use power', file=ofile)
+            print( '    }', file=ofile)
+            print( '    if {[port VPB class] == "default"} {', file=ofile)
+            print( '        port VPB class bidirectional', file=ofile)
+            print( '    }', file=ofile)
+            print( '}', file=ofile)
+            print( 'if {![catch {set vnbpin [port VNB index]}]} {', file=ofile)
+            print( '    if {[port VNB use] == "default"} {', file=ofile)
+            print( '        port VNB use ground', file=ofile)
+            print( '    }', file=ofile)
+            print( '    if {[port VNB class] == "default"} {', file=ofile)
+            print( '        port VNB class bidirectional', file=ofile)
+            print( '    }', file=ofile)
+            print( '}', file=ofile)
+
         print(f'lef write {escaped_cell} -toplayer', file=ofile)
 
         # Override the port order to match the order given in the CDL file.