diff --git a/doc/advopt.txt b/doc/advopt.txt
index 3b6fafd0f..fc3e1e4e6 100644
--- a/doc/advopt.txt
+++ b/doc/advopt.txt
@@ -19,6 +19,10 @@ Advanced commands:
     --context               list possible invokation context
     --usages                list all usages of the symbol at position
     --eval                  evaluates an expression
+  //serve                   start the compiler as a service mode (CAAS)
+    --server.type:TYPE      either stdin or tcp
+    --server.port:PORT      port for tcp mode, by default 6000
+    --server.address:HOST   binds to that address, by default ""
 
 Advanced options:
   -m, --mainmodule:FILE     set the project main module