diff --git a/README.md b/README.md
index 447ed88..3b7b014 100644
--- a/README.md
+++ b/README.md
@@ -21,14 +21,14 @@
 ## User Application Requirements and APIs
 
 - The process to access hardware register data will vary per user application.
-  Therefore, this library will declare the hardware access [user APIs][], but each
-  user application must implement the APIs for their own environment.
+  Therefore, this library will declare the hardware access [user APIs][], but
+  each user application must implement the APIs for their own environment.
 - This library will not contain data regarding hardware specific information.
   Instead, that information will be provided by the user application in the form
   of the [Chip Data Files][].
 - Tracing, or logging, methods will vary per user application. Therefore, this
-  library will declare the tracing/logging [user APIs][], but each user application
-  must implement the APIs for their own environment.
+  library will declare the tracing/logging [user APIs][], but each user
+  application must implement the APIs for their own environment.
 
 ## Environment configuration
 
diff --git a/chip_data/parse_chip_data.py b/chip_data/parse_chip_data.py
index e000d5d..7de4d14 100755
--- a/chip_data/parse_chip_data.py
+++ b/chip_data/parse_chip_data.py
@@ -40,11 +40,11 @@
             binary_encode(model_ec, base, fp)
 
 
-def gen_peltool_json(indir: str, outdir: str) -> None:
-    for model_ec, base in _import_chip_data(indir).items():
+def gen_peltool_json(cdIndir: str, outdir: str, exSigPath=None) -> None:
+    for model_ec, base in _import_chip_data(cdIndir).items():
         file = f"pel_parser_data_{model_ec.lower()}.json"
         with open(os.path.join(outdir, file), "w") as fp:
-            peltool_encode(model_ec, base, fp)
+            peltool_encode(model_ec, base, fp, exSigPath)
 
 
 if __name__ == "__main__":
diff --git a/chip_data/pyprd/chip_data/peltool.py b/chip_data/pyprd/chip_data/peltool.py
index f1939cc..4428b46 100644
--- a/chip_data/pyprd/chip_data/peltool.py
+++ b/chip_data/pyprd/chip_data/peltool.py
@@ -1,4 +1,6 @@
 import json
+import os.path
+import re
 from collections import namedtuple
 
 from pyprd.chip_data import chip_data as cd
@@ -25,7 +27,7 @@
 # Public functions
 
 
-def peltool_encode(model_ec: str, base: cd.Base, fp: object):
+def peltool_encode(model_ec: str, base: cd.Base, fp: object, exSigPath: str):
     """
     Pulls the necessary information from the Chip Data object and writes the
     eBMC PEL parser (peltool) JSON data to the given file pointer. Note that
@@ -45,6 +47,7 @@
         "attn_types": {},
         "registers": {},
         "signatures": {},
+        "extra_signatures": {},
     }
 
     for attn_type in base.root_nodes.keys():
@@ -74,5 +77,20 @@
         for pos, bit in iso_node.bits.items():
             node[1][pos] = bit.desc
 
+    # If the input extra signature file exists, add those to the data.
+    if os.path.isfile(exSigPath):
+        with open(exSigPath, "r") as sigFp:
+            fileData = sigFp.read()
+            sigPattern = r'PRD_EXTRA_SIG\s*\(\s*([^"]*)\s*,\s*(0x[0-9A-Fa-f]{8})\s*,\s*"([^"]*)"'
+
+            sigs = re.findall(sigPattern, fileData)
+            for sig in sigs:
+                hexValue = sig[1].lower()
+                # Remove the 0x prefix from the hex string for consistency with
+                # other hex IDs used.
+                hexValue = hexValue[2:]
+                desc = sig[2]
+                data["extra_signatures"][hexValue] = desc
+
     json.dump(data, fp, indent=4, sort_keys=True)
     fp.write("\n")