dynbuf: add Curl_dyn_vaddf

Closes #6004

1 files changed, 6 insertions, 0 deletions

diff --git a/docs/DYNBUF.md b/docs/DYNBUF.md
index 382c1365d..aa528ec3a 100644
--- a/docs/DYNBUF.md
+++ b/docs/DYNBUF.md
@@ -42,6 +42,12 @@ Append a C string to the end of the buffer.
 
 Append a `printf()`-style string to the end of the buffer.
 
+## vaddf
+
+    CURLcode Curl_dyn_vaddf(struct dynbuf *s, const char *fmt, va_list ap);
+
+Append a `vprintf()`-style string to the end of the buffer.
+
 ## reset
 
     void Curl_dyn_reset(struct dynbuf *s);