Index: openacs-4/packages/xotcl-core/tcl/03-doc-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xotcl-core/tcl/03-doc-procs.tcl,v
diff -u -N -r1.22.2.3 -r1.22.2.4
--- openacs-4/packages/xotcl-core/tcl/03-doc-procs.tcl	21 Nov 2019 09:09:08 -0000	1.22.2.3
+++ openacs-4/packages/xotcl-core/tcl/03-doc-procs.tcl	20 Jan 2020 17:33:20 -0000	1.22.2.4
@@ -500,7 +500,7 @@
     }
 
     # argument documentation finished
-    set proc_index [::xo::api proc_index $scope $obj ${inst}proc $proc_name]
+    set proc_index [string trimleft [::xo::api proc_index $scope $obj ${inst}proc $proc_name] :]
     if {![nsv_exists api_proc_doc $proc_index]} {
       nsv_lappend api_proc_doc_scripts [dict get $doc script] $proc_index
     }