diff --git a/sky130/Makefile.in b/sky130/Makefile.in
index 2ac9c4c..1da74c2 100644
--- a/sky130/Makefile.in
+++ b/sky130/Makefile.in
@@ -1050,7 +1050,7 @@
 		-lef %l/latest/cells/*/*.magic.lef compile-only \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
-		-lib %l/latest/timing/*.lib \
+		-lib %l/latest/timing/*.lib filter=custom/scripts/add_wireloads.py \
 		-gds %l/latest/cells/*/*.gds compile-only \
 			options=custom/scripts/gds_import_setup.tcl \
 			sort=../common/sort_pdkfiles.py \
@@ -1091,7 +1091,7 @@
 		-lef %l/latest/cells/*/*.magic.lef compile-only \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
-		-lib %l/latest/timing/*.lib \
+		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
 		-gds %l/latest/cells/*/*.gds compile-only \
 			options=custom/scripts/gds_import_setup.tcl \
 			sort=../common/sort_pdkfiles.py \
@@ -1127,7 +1127,7 @@
 		-lef %l/latest/cells/*/*.magic.lef compile-only \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
-		-lib %l/latest/timing/*.lib \
+		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
 		-gds %l/latest/cells/*/*.gds compile-only \
 			options=custom/scripts/gds_import_setup.tcl \
 			sort=../common/sort_pdkfiles.py \
@@ -1166,7 +1166,7 @@
 		-lef %l/latest/cells/*/*.magic.lef compile-only \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
-		-lib %l/latest/timing/*.lib \
+		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
 		-gds %l/latest/cells/*/*.gds compile-only \
 			options=custom/scripts/gds_import_setup.tcl \
 			sort=../common/sort_pdkfiles.py \
@@ -1198,7 +1198,7 @@
 		-lef %l/latest/cells/*/*.magic.lef compile-only \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
-		-lib %l/latest/timing/*.lib \
+		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
 		-gds %l/latest/cells/*/*.gds compile-only \
 			exclude=sky130_fd_sc_hs__decap_8.gds \
 			options=custom/scripts/gds_import_setup.tcl \
@@ -1227,7 +1227,7 @@
 		-lef %l/latest/cells/*/*.magic.lef compile-only \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
-		-lib %l/latest/timing/*.lib \
+		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
 		-gds %l/latest/cells/*/*.gds compile-only \
 			options=custom/scripts/gds_import_setup.tcl \
 			sort=../common/sort_pdkfiles.py \
@@ -1255,7 +1255,7 @@
 		-lef %l/latest/cells/*/*.magic.lef compile-only \
 			sort=../common/sort_pdkfiles.py \
 		-doc %l/latest/cells/*/*.pdf \
-		-lib %l/latest/timing/*.lib \
+		-lib %l/latest/timing/*.lib custom/scripts/add_wireloads.py \
 		-gds %l/latest/cells/*/*.gds compile-only \
 			options=custom/scripts/gds_import_setup.tcl \
 			sort=../common/sort_pdkfiles.py \
diff --git a/sky130/custom/scripts/add_wireloads.py b/sky130/custom/scripts/add_wireloads.py
new file mode 100755
index 0000000..89480ce
--- /dev/null
+++ b/sky130/custom/scripts/add_wireloads.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+#
+# add_wireloads ---
+#
+# This script adds wireload models to the digital standard cell library
+# liberty timing files.  No wireload models were provided with the
+# foundry set.
+#
+# This script is a filter to be run by setting the name of this script as
+# the value to "filter=" for the lib install in the sky130 Makefile.
+
+import re
+import os
+import sys
+
+def filter(inname, outname):
+
+    # Read input
+    try:
+        with open(inname, 'r') as inFile:
+            stext = inFile.read()
+            slines = stext.splitlines()
+    except:
+        print('add_wireloads.py: failed to open ' + fnmIn + ' for reading.', file=sys.stderr)
+        return 1
+
+    # Process input with regexp
+
+    fixedlines = []
+    modified = False
+
+    lutrex = re.compile('[ \t]*power_lut_template.*')
+
+    for line in slines:
+
+        # Check for first power_lut_template
+        lmatch = lutrex.match(line)
+        if lmatch and not modified:
+            # Read and add the contents of "wireload.lib"
+            with open('custom/scripts/wireload.lib', 'r') as libFile:
+                ltext = libFile.read()
+                for lline in ltext.splitlines():
+                    fixedlines.append(lline)
+
+            modified = True
+
+        fixedlines.append(line)
+
+    # Write output
+    if outname == None:
+        for i in fixedlines:
+            print(i)
+    else:
+        # If the output is a symbolic link but no modifications have been made,
+        # then leave it alone.  If it was modified, then remove the symbolic
+        # link before writing.
+        if os.path.islink(outname):
+            if not modified:
+                return 0
+            else:
+                os.unlink(outname)
+        try:
+            with open(outname, 'w') as outFile:
+                for i in fixedlines:
+                    print(i, file=outFile)
+        except:
+            print('add_wireloads.py: failed to open ' + outname + ' for writing.', file=sys.stderr)
+            return 1
+
+
+if __name__ == '__main__':
+
+    # This script expects to get one or two arguments.  One argument is
+    # mandatory and is the input file.  The other argument is optional and
+    # is the output file.  The output file and input file may be the same
+    # name, in which case the original input is overwritten.
+
+    options = []
+    arguments = []
+    for item in sys.argv[1:]:
+        if item.find('-', 0) == 0:
+            options.append(item[1:])
+        else:
+            arguments.append(item)
+
+    if len(arguments) > 0:
+        infilename = arguments[0]
+
+    if len(arguments) > 1:
+        outfilename = arguments[1]
+    else:
+        outfilename = None
+
+    result = filter(infilename, outfilename)
+    sys.exit(result)
diff --git a/sky130/custom/scripts/wireload.lib b/sky130/custom/scripts/wireload.lib
new file mode 100644
index 0000000..cec7933
--- /dev/null
+++ b/sky130/custom/scripts/wireload.lib
@@ -0,0 +1,53 @@
+    /* Wire load tables */
+
+    wire_load("Small") {
+      capacitance : 1.42e-05;
+      resistance : 0.0745;
+      slope : 8.3631;
+      fanout_length( 1, 23.2746);
+      fanout_length( 2, 32.1136);
+      fanout_length( 3, 48.4862);
+      fanout_length( 4, 64.0974);
+      fanout_length( 5, 86.2649);
+      fanout_length( 6, 84.2649);
+    }
+
+    wire_load("Medium") {
+      capacitance : 1.42e-05;
+      resistance : 0.0745;
+      slope : 8.3631;
+      fanout_length( 1, 23.2746);
+      fanout_length( 2, 32.1136);
+      fanout_length( 3, 48.4862);
+      fanout_length( 4, 64.0974);
+      fanout_length( 5, 86.2649);
+      fanout_length( 6, 84.2649);
+    }
+
+    wire_load("Large") {
+      capacitance : 1.42e-05;
+      resistance : 0.0745;
+      slope : 8.3631;
+      fanout_length( 1, 23.2746);
+      fanout_length( 2, 32.1136);
+      fanout_length( 3, 48.4862);
+      fanout_length( 4, 64.0974);
+      fanout_length( 5, 86.2649);
+      fanout_length( 6, 84.2649);
+    }
+
+    wire_load("Huge") {
+      capacitance : 1.42e-05;
+      resistance : 0.0745;
+      slope : 8.3631;
+      fanout_length( 1, 23.2746);
+      fanout_length( 2, 32.1136);
+      fanout_length( 3, 48.4862);
+      fanout_length( 4, 64.0974);
+      fanout_length( 5, 86.2649);
+      fanout_length( 6, 84.2649);
+    }
+
+    default_wire_load : "Small" ;
+    default_wire_load_mode : top;
+