Github user mattf-horton commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/516#discussion_r110964577
--- Diff: metron-platform/metron-common/README.md ---
@@ -434,6 +466,14 @@ The `!=` operator is the negation of the above.
* dateTime - The datetime as a long representing the milliseconds
since unix epoch
* Returns: The current month (0-based).
+### `PREPEND_IF_MISSING`
+ * Description: Prepends the prefix to the start of the string if the
string does not already start with any of the prefixes.
+ * Input:
+ * string - The string to be prepended.
+ * prefix - The string prefix to prepend to the start of the string.
+ * prefixes - Optional - Additional string prefixes that are valid.
--- End diff --
ditto
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