diff --git a/cells/tap/sky130_fd_sc_ls__tap_1.lef b/cells/tap/sky130_fd_sc_ls__tap_1.lef
index 44a05c8..80f84a6 100644
--- a/cells/tap/sky130_fd_sc_ls__tap_1.lef
+++ b/cells/tap/sky130_fd_sc_ls__tap_1.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__tap_1
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/tap/sky130_fd_sc_ls__tap_1.magic.lef b/cells/tap/sky130_fd_sc_ls__tap_1.magic.lef
index 507cd11..c827c4e 100644
--- a/cells/tap/sky130_fd_sc_ls__tap_1.magic.lef
+++ b/cells/tap/sky130_fd_sc_ls__tap_1.magic.lef
@@ -23,7 +23,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__tap_1
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   FOREIGN sky130_fd_sc_ls__tap_1 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/tap/sky130_fd_sc_ls__tap_2.lef b/cells/tap/sky130_fd_sc_ls__tap_2.lef
index 7fbcd3b..0a5c984 100644
--- a/cells/tap/sky130_fd_sc_ls__tap_2.lef
+++ b/cells/tap/sky130_fd_sc_ls__tap_2.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__tap_2
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.960000 BY  3.330000 ;
diff --git a/cells/tap/sky130_fd_sc_ls__tap_2.magic.lef b/cells/tap/sky130_fd_sc_ls__tap_2.magic.lef
index 6999044..ff99fed 100644
--- a/cells/tap/sky130_fd_sc_ls__tap_2.magic.lef
+++ b/cells/tap/sky130_fd_sc_ls__tap_2.magic.lef
@@ -23,7 +23,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__tap_2
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   FOREIGN sky130_fd_sc_ls__tap_2 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.960000 BY  3.330000 ;
diff --git a/cells/tapmet1/sky130_fd_sc_ls__tapmet1_2.lef b/cells/tapmet1/sky130_fd_sc_ls__tapmet1_2.lef
index 7d6ce72..a07f239 100644
--- a/cells/tapmet1/sky130_fd_sc_ls__tapmet1_2.lef
+++ b/cells/tapmet1/sky130_fd_sc_ls__tapmet1_2.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__tapmet1_2
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.960000 BY  3.330000 ;
diff --git a/cells/tapmet1/sky130_fd_sc_ls__tapmet1_2.magic.lef b/cells/tapmet1/sky130_fd_sc_ls__tapmet1_2.magic.lef
index e930254..b87982b 100644
--- a/cells/tapmet1/sky130_fd_sc_ls__tapmet1_2.magic.lef
+++ b/cells/tapmet1/sky130_fd_sc_ls__tapmet1_2.magic.lef
@@ -23,7 +23,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__tapmet1_2
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   FOREIGN sky130_fd_sc_ls__tapmet1_2 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.960000 BY  3.330000 ;
diff --git a/cells/tapvgnd/sky130_fd_sc_ls__tapvgnd_1.lef b/cells/tapvgnd/sky130_fd_sc_ls__tapvgnd_1.lef
index 5effbfe..fb02c9a 100644
--- a/cells/tapvgnd/sky130_fd_sc_ls__tapvgnd_1.lef
+++ b/cells/tapvgnd/sky130_fd_sc_ls__tapvgnd_1.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__tapvgnd_1
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/tapvgnd/sky130_fd_sc_ls__tapvgnd_1.magic.lef b/cells/tapvgnd/sky130_fd_sc_ls__tapvgnd_1.magic.lef
index f8006f0..8cb30d7 100644
--- a/cells/tapvgnd/sky130_fd_sc_ls__tapvgnd_1.magic.lef
+++ b/cells/tapvgnd/sky130_fd_sc_ls__tapvgnd_1.magic.lef
@@ -23,7 +23,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__tapvgnd_1
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   FOREIGN sky130_fd_sc_ls__tapvgnd_1 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/tapvgnd2/sky130_fd_sc_ls__tapvgnd2_1.lef b/cells/tapvgnd2/sky130_fd_sc_ls__tapvgnd2_1.lef
index cee73fb..35245a6 100644
--- a/cells/tapvgnd2/sky130_fd_sc_ls__tapvgnd2_1.lef
+++ b/cells/tapvgnd2/sky130_fd_sc_ls__tapvgnd2_1.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__tapvgnd2_1
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/tapvgnd2/sky130_fd_sc_ls__tapvgnd2_1.magic.lef b/cells/tapvgnd2/sky130_fd_sc_ls__tapvgnd2_1.magic.lef
index 0bc9067..a4efb3c 100644
--- a/cells/tapvgnd2/sky130_fd_sc_ls__tapvgnd2_1.magic.lef
+++ b/cells/tapvgnd2/sky130_fd_sc_ls__tapvgnd2_1.magic.lef
@@ -23,7 +23,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__tapvgnd2_1
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   FOREIGN sky130_fd_sc_ls__tapvgnd2_1 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/tapvgndnovpb/sky130_fd_sc_ls__tapvgndnovpb_1.lef b/cells/tapvgndnovpb/sky130_fd_sc_ls__tapvgndnovpb_1.lef
index c09ba78..e0f5c3d 100644
--- a/cells/tapvgndnovpb/sky130_fd_sc_ls__tapvgndnovpb_1.lef
+++ b/cells/tapvgndnovpb/sky130_fd_sc_ls__tapvgndnovpb_1.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__tapvgndnovpb_1
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/tapvgndnovpb/sky130_fd_sc_ls__tapvgndnovpb_1.magic.lef b/cells/tapvgndnovpb/sky130_fd_sc_ls__tapvgndnovpb_1.magic.lef
index a37b798..895b81d 100644
--- a/cells/tapvgndnovpb/sky130_fd_sc_ls__tapvgndnovpb_1.magic.lef
+++ b/cells/tapvgndnovpb/sky130_fd_sc_ls__tapvgndnovpb_1.magic.lef
@@ -23,7 +23,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__tapvgndnovpb_1
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   FOREIGN sky130_fd_sc_ls__tapvgndnovpb_1 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/tapvpwrvgnd/sky130_fd_sc_ls__tapvpwrvgnd_1.lef b/cells/tapvpwrvgnd/sky130_fd_sc_ls__tapvpwrvgnd_1.lef
index f2370b6..645916f 100644
--- a/cells/tapvpwrvgnd/sky130_fd_sc_ls__tapvpwrvgnd_1.lef
+++ b/cells/tapvpwrvgnd/sky130_fd_sc_ls__tapvpwrvgnd_1.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__tapvpwrvgnd_1
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/tapvpwrvgnd/sky130_fd_sc_ls__tapvpwrvgnd_1.magic.lef b/cells/tapvpwrvgnd/sky130_fd_sc_ls__tapvpwrvgnd_1.magic.lef
index 6d77547..6213ae4 100644
--- a/cells/tapvpwrvgnd/sky130_fd_sc_ls__tapvpwrvgnd_1.magic.lef
+++ b/cells/tapvpwrvgnd/sky130_fd_sc_ls__tapvpwrvgnd_1.magic.lef
@@ -23,7 +23,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__tapvpwrvgnd_1
-  CLASS CORE ;
+  CLASS CORE WELLTAP ;
   FOREIGN sky130_fd_sc_ls__tapvpwrvgnd_1 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;