diff --git a/doc_src/cmds/psub.rst b/doc_src/cmds/psub.rst
index cdd4008f0..f83e086cc 100644
--- a/doc_src/cmds/psub.rst
+++ b/doc_src/cmds/psub.rst
@@ -6,7 +6,7 @@ psub - perform process substitution
 Synopsis
 --------
 
-*COMMAND1* ( *COMMAND2* | ``psub`` [**-F** | -**-fifo**] [**-f** | **--file**] [**-s** *SUFFIX*] )
+*COMMAND1* ( *COMMAND2* | ``psub`` [**-F** | -**-fifo**] [**-f** | **--file**] [(**-s** | **--suffix**) *SUFFIX*] )
 
 Description
 -----------