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diff --git a/examples/validate_mmcif.py b/examples/validate_mmcif.py
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+++ b/examples/validate_mmcif.py
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+# This example demonstrates the use of the Python IHM library's validator
+# to validate a user-provided input mmCIF file.
+# See also validate_modbase.py for a more detailed example.
+
+import sys
+import ihm.dictionary
+import urllib.request
+
+
+if len(sys.argv) != 2:
+    print("Usage: %s input.cif" % sys.argv[0], file=sys.stderr)
+    sys.exit(1)
+fname = sys.argv[1]
+
+# Read in the ModelCIF and PDBx dictionary from https://mmcif.wwpdb.org/
+with urllib.request.urlopen(
+        'https://mmcif.wwpdb.org/dictionaries/ascii/mmcif_ma.dic') as fh:
+    pdbx_mcif = ihm.dictionary.read(fh)
+
+# Validate the mmCIF file assuming it is UTF8 encoded.
+# See validate_modbase.py for code to fallback to ASCII for non-UTF8 files.
+with open(fname, encoding='UTF-8') as fh:
+    pdbx_mcif.validate(fh)
+
+# Similarly, to validate a BinaryCIF file, use:
+# with open(fname, 'rb') as fh:
+#    pdbx_mcif.validate(fh, format='BCIF')