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diff --git a/tools/build/v2/engine/command.h b/tools/build/v2/engine/command.h
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+++ b/tools/build/v2/engine/command.h
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+/*
+ * Copyright 1994 Christopher Seiwald.
+ *
+ * This file is part of Jam - see jam.c for Copyright information.
+ */
+
+/*
+ * command.h - the CMD structure and routines to manipulate them
+ *
+ * Both ACTION and CMD contain a rule, targets, and sources.  An
+ * ACTION describes a rule to be applied to the given targets and
+ * sources; a CMD is what actually gets executed by the shell.  The
+ * differences are due to:
+ *
+ *  ACTIONS must be combined if 'actions together' is given.
+ *  ACTIONS must be split if 'actions piecemeal' is given.
+ *  ACTIONS must have current sources omitted for 'actions updated'.
+ *
+ * The CMD datatype holds a single command that is to be executed
+ * against a target, and they can chain together to represent the
+ * full collection of commands used to update a target.
+ *
+ * Structures:
+ *
+ *  CMD - an action, ready to be formatted into a buffer and executed.
+ *
+ * External routines:
+ *
+ *  cmd_new() - return a new CMD or 0 if too many args.
+ *  cmd_free() - delete CMD and its parts.
+ *  cmd_next() - walk the CMD chain.
+ */
+
+
+/*
+ * CMD - an action, ready to be formatted into a buffer and executed.
+ */
+
+typedef struct _cmd CMD;
+
+struct _cmd
+{
+    CMD  * next;
+    CMD  * tail;   /* valid on in head */
+    RULE * rule;   /* rule->actions contains shell script */
+    LIST * shell;  /* $(SHELL) value */
+    LOL    args;   /* LISTs for $(<), $(>) */
+    char * buf;    /* actual commands */
+};
+
+CMD * cmd_new
+(
+    RULE * rule,     /* rule (referenced) */
+    LIST * targets,  /* $(<) (freed) */
+    LIST * sources,  /* $(>) (freed) */
+    LIST * shell     /* $(SHELL) (freed) */
+);
+
+void cmd_free( CMD * );
+
+#define cmd_next( c ) ( ( c )->next )