diff --git a/doc/configuration.txt b/doc/configuration.txt
index f8c29b241..c75bb5569 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -15459,30 +15459,30 @@ ungrpc(<field_number>,[<field_type>])
       PPoint hi = 49;
     }
 
-    let's say a body request is made of a "Rectangle" object value (two PPoint
-    protocol buffers messages), the four protocol buffers fields could be
-    extracted with these "ungrpc" directives:
+  let's say a body request is made of a "Rectangle" object value (two PPoint
+  protocol buffers messages), the four protocol buffers fields could be
+  extracted with these "ungrpc" directives:
 
     req.body,ungrpc(48.59.1,int32) # "latitude" of "lo" first PPoint
     req.body,ungrpc(48.59.2,int32) # "longitude" of "lo" first PPoint
     req.body,ungrpc(49.59.1,int32) # "latitude" of "hi" second PPoint
     req.body,ungrpc(49.59.2,int32) # "longitude" of "hi" second PPoint
 
-    We could also extract the intermediary 48.59 field as a binary sample as follows:
+  We could also extract the intermediary 48.59 field as a binary sample as follows:
 
     req.body,ungrpc(48.59)
 
-    As a gRPC message is always made of a gRPC header followed by protocol buffers
-    messages, in the previous example the "latitude" of "lo" first PPoint
-    could be extracted with these equivalent directives:
+  As a gRPC message is always made of a gRPC header followed by protocol buffers
+  messages, in the previous example the "latitude" of "lo" first PPoint
+  could be extracted with these equivalent directives:
 
     req.body,ungrpc(48.59),protobuf(1,int32)
     req.body,ungrpc(48),protobuf(59.1,int32)
     req.body,ungrpc(48),protobuf(59),protobuf(1,int32)
 
-    Note that the first convert must be "ungrpc", the remaining ones must be
-    "protobuf" and only the last one may have or not a second argument to
-    interpret the previous binary sample.
+  Note that the first convert must be "ungrpc", the remaining ones must be
+  "protobuf" and only the last one may have or not a second argument to
+  interpret the previous binary sample.
 
 
 unset-var(<var name>)