diff --git a/tools/extract_asn1.py b/tools/extract_asn1.py
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+++ b/tools/extract_asn1.py
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+# Script to extract complete ASN.1 code from ETSI TS 103 666 series of specifications
+# Steps to run:
+# 1. Download the specification as a word document and open it
+# 2. In "view" menu, select draft or web layout (needed to removed page header and footers)
+# 3. Save the document as a text file
+#      If requested, select "Text ending: MS-DOS" and "End lines with: CR only"
+# 4. Call the script: python extract_asn1.py "<text_file>"
+# The script generates ETSI_TS_103_666_asn1_definitions.asn
+import sys
+
+inFile = open(sys.argv[1])
+outFile = open("ETSI_TS_103_666_asn1_definitions.asn", "w")
+
+copy = False
+for line in inFile:
+    if line.strip() == "-- ASN1START":
+        copy = True
+    elif line.strip() == "-- ASN1STOP":
+        copy = False
+    elif copy:
+        outFile.write(line)
+inFile.close()
+outFile.close()