diff --git a/Documentation/doc/scripts/generate_how_to_cite.py b/Documentation/doc/scripts/generate_how_to_cite.py
index 7f025c71748..21037011e54 100644
--- a/Documentation/doc/scripts/generate_how_to_cite.py
+++ b/Documentation/doc/scripts/generate_how_to_cite.py
@@ -321,7 +321,7 @@ def main():
             )
             assert not foundDouble, (
                 """Multiple use of citation name '{}' package '{}'
-                first occurence package '{}'
+                first occurrence package '{}'
                 """.format(bib,pkg,citeDic[bib])
             )
             result_txt += gen_txt_entry(title, authors, bib, anchor, k)