diff --git a/docs/libcurl/opts/CURLOPT_POSTFIELDS.3 b/docs/libcurl/opts/CURLOPT_POSTFIELDS.3
index d3a9ec3d1dfbd3c0115b2313d174e2cb3d92d38d..d55914308b2e1c3d84a65ff82a62dd67590dde79 100644
--- a/docs/libcurl/opts/CURLOPT_POSTFIELDS.3
+++ b/docs/libcurl/opts/CURLOPT_POSTFIELDS.3
@@ -35,6 +35,8 @@ way. For example, the web server may assume that this data is url-encoded.
 
 The data pointed to is NOT copied by the library: as a consequence, it must be
 preserved by the calling application until the associated transfer finishes.
+This behaviour can be changed (so libcurl does copy the data) by setting the
+\fICURLOPT_COPYPOSTFIELDS(3)\fP option.
 
 This POST is a normal application/x-www-form-urlencoded kind (and libcurl will
 set that Content-Type by default when this option is used), which is commonly