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-rw-r--r--include/asterisk/pbx.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asterisk/pbx.h b/include/asterisk/pbx.h
index c8c171a71..a40c6a45b 100644
--- a/include/asterisk/pbx.h
+++ b/include/asterisk/pbx.h
@@ -1432,7 +1432,7 @@ void ast_str_substitute_variables_varshead(struct ast_str **buf, ssize_t maxlen,
* \param c Channel variables from which to extract values, and channel to pass to any dialplan functions.
* \param headp If no channel is specified, a channel list from which to extract variable values
* \param templ Variable template to expand.
- * \param used Number of bytes read from the template.
+ * \param used Number of bytes read from the template. (May be NULL)
*/
void ast_str_substitute_variables_full(struct ast_str **buf, ssize_t maxlen, struct ast_channel *c, struct varshead *headp, const char *templ, size_t *used);
/*! @} */