diff --git a/runtime/doc/index.txt b/runtime/doc/index.txt
index 83be4a5..c95de5b 100644
--- a/runtime/doc/index.txt
+++ b/runtime/doc/index.txt
@@ -1623,6 +1623,8 @@
 |:tab|		:tab		create new tab when opening new window
 |:tag|		:ta[g]		jump to tag
 |:tags|		:tags		show the contents of the tag stack
+|:tcd|		:tcd		change directory for tab page
+|:tchdir|	:tch[dir]	change directory for tab page
 |:tcl|		:tc[l]		execute Tcl command
 |:tcldo|	:tcld[o]	execute Tcl command for each line
 |:tclfile|	:tclf[ile]	execute Tcl script file