diff --git a/docs/yap.tex b/docs/yap.tex
index ddd2b5bf0..e4abb169d 100644
--- a/docs/yap.tex
+++ b/docs/yap.tex
@@ -4257,13 +4257,13 @@ Succeeds if @var{S} is a currently open stream.
 @findex flush_output/0
 @syindex flush_output/0
 @cnindex flush_output/0
-Send all data in the output buffer to current output stream.
+Send out all data in the output buffer of the current output stream.
 
 @item flush_output(+@var{S}) [ISO]
 @findex flush_output/1
 @syindex flush_output/1
 @cnindex flush_output/1
-Send all data in the output buffer to stream @var{S}.
+Send all data in the output buffer for stream @var{S}.
 
 @item set_input(+@var{S})
 @findex set_input/1