From 97a5f6c89c7b937e0a1192e02a7dc94f64f558cf Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Fri, 16 Mar 2018 17:11:39 +0100
Subject: erts: Add statement about errno to enif_*printf docs

---
 erts/doc/src/erl_nif.xml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'erts/doc')

diff --git a/erts/doc/src/erl_nif.xml b/erts/doc/src/erl_nif.xml
index 1daac88d47..6b9ca971dc 100644
--- a/erts/doc/src/erl_nif.xml
+++ b/erts/doc/src/erl_nif.xml
@@ -1252,7 +1252,8 @@ typedef struct {
         <p>Similar to <c>fprintf</c> but this format string also accepts
           <c>"%T"</c>, which formats Erlang terms.</p>
 	<p>This function was originally intenden for debugging purpose. It is not
-	  recommended to print very large terms with <c>%T</c>.</p>
+	  recommended to print very large terms with <c>%T</c>. The function may
+	  change <c>errno</c>, even if successful.</p>
       </desc>
     </func>
 
@@ -3178,7 +3179,8 @@ if (retval &amp; ERL_NIF_SELECT_STOP_CALLED) {
         <p>Similar to <c>snprintf</c> but this format string also accepts
           <c>"%T"</c>, which formats Erlang terms.</p>
 	<p>This function was originally intenden for debugging purpose. It is not
-	  recommended to print very large terms with <c>%T</c>.</p>
+	  recommended to print very large terms with <c>%T</c>. The function may
+	  change <c>errno</c>, even if successful.</p>
       </desc>
     </func>
 
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