diff --git a/basis/compiler/cfg/def-use/def-use-docs.factor b/basis/compiler/cfg/def-use/def-use-docs.factor
index 39e9eb6a7f..320e0550bb 100644
--- a/basis/compiler/cfg/def-use/def-use-docs.factor
+++ b/basis/compiler/cfg/def-use/def-use-docs.factor
@@ -1,6 +1,11 @@
-USING: compiler.cfg.instructions help.markup help.syntax sequences ;
+USING: compiler.cfg compiler.cfg.instructions help.markup help.syntax
+sequences ;
 IN: compiler.cfg.def-use
 
+HELP: compute-insns
+{ $values { "cfg" cfg } }
+{ $description "Computes a mapping from vregs to the instructions that define them and store the result in the " { $link insns } " variable." } ;
+
 HELP: defs-vregs
 { $values { "insn" insn } { "seq" sequence } }
 { $description "Returns the sequence of vregs defined, or introduced, by this instruction." }
@@ -12,6 +17,14 @@ HELP: defs-vregs
   }
 } ;
 
+HELP: insn-of
+{ $values { "vreg" "virtual register" } { "insn" insn } }
+{ $description "Maps the vreg to the instruction that defined it." } ;
+
+HELP: temp-vregs
+{ $values { "insn" insn } { "seq" sequence } }
+{ $description "Returns the sequence of temporary vregs used by this instruction." } ;
+
 HELP: uses-vregs
 { $values { "insn" insn } { "seq" sequence } }
 { $description "Returns the sequence of vregs used by this instruction." }
@@ -23,6 +36,14 @@ HELP: uses-vregs
   }
 } ;
 
-HELP: temp-vregs
-{ $values { "insn" insn } { "seq" sequence } }
-{ $description "Returns the sequence of temporary vregs used by this instruction." } ;
+ARTICLE: "compiler.cfg.def-use" "Common code used by several passes for def-use analysis"
+"The " { $vocab-link "compiler.cfg.def-use" } " contains tools to correlate SSA instructions with virtual registers defined or used by them."
+$nl
+"Vregs for a given instruction:"
+{ $subsections
+  defs-vregs
+  temp-vregs
+  uses-vregs
+} ;
+
+ABOUT: "compiler.cfg.def-use"