diff --git a/docs/usermanual.md b/docs/usermanual.md
index 0e344e28..f2a415a1 100644
--- a/docs/usermanual.md
+++ b/docs/usermanual.md
@@ -297,7 +297,7 @@ Robot1@turn|left
 HTTP bindig is returning in a HTTP header named `X-Processing-Time` processing time (in milliseconds) expended by current HTTP measure
 request. For example:
 ```
-X-Processing-Time: 38 ms 
+X-Processing-Time: 38
 ```
 
 #### MQTT binding