diff --git a/DOCS/tech/slave.txt b/DOCS/tech/slave.txt
index 96fa4ec1fe..3510a24cb5 100644
--- a/DOCS/tech/slave.txt
+++ b/DOCS/tech/slave.txt
@@ -31,9 +31,9 @@ audio_delay <value>
 
 [brightness|contrast|gamma|hue|saturation] <value> [<abs>]
     Set/adjust video parameters.
-    If abs is not given or zero, modifies parameter by <value>.
-    If abs is non-zero, parameter is set to <value>
-    <value> is in the range [-100, 100]
+    If abs is not given or is zero, modifies parameter by <value>.
+    If abs is non-zero, parameter is set to <value>.
+    <value> is in the range [-100, 100].
 
 change_rectangle <val1> <val2>
     Change the position of the rectangle filter rectangle.