diff --git a/doc/Changelog b/doc/Changelog
index b53e38e66..3ab23226d 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -1,3 +1,7 @@
+31 October 2017: Wouter 
+	- Document that errno is left informative on libunbound config read
+	  fail.
+
 25 October 2017: Ralph
 	- Fixed libunbound manual typo.
 	- Fix #1949: [dnscrypt] make provider name mismatch more obvious.
diff --git a/doc/libunbound.3.in b/doc/libunbound.3.in
index 5f801b232..8fd1b8967 100644
--- a/doc/libunbound.3.in
+++ b/doc/libunbound.3.in
@@ -407,6 +407,10 @@ returns NULL on an error (a malloc failure).
 returns true if some information may be available, false otherwise.
 .B ub_fd
 returns a file descriptor or \-1 on error.
+.B ub_ctx_config
+and
+.B ub_ctx_resolvconf
+attempt to leave errno informative on a function return with file read failure.
 .SH "SEE ALSO"
 \fIunbound.conf\fR(5), 
 \fIunbound\fR(8).