diff --git a/util/cpp/cpp.6 b/util/cpp/cpp.6
index 38b37178..99e6508f 100644
--- a/util/cpp/cpp.6
+++ b/util/cpp/cpp.6
@@ -47,6 +47,8 @@ if \fIfile\fR is not given, do not preprocess, but instead generate a list
 of makefile dependencies and write them to the standard output.
 If \fIfile\fP is given, generate preprocessor output on standard output,
 and generate the list of makefile dependencies on file \fIfile\fP.
+.IP -\fBA\fR[\fIfile\fR]
+identical to the -d option.
 .IP -\fBxs\fR
 when generating makefile dependencies, do not include files from
 /usr/include.
diff --git a/util/cpp/options.c b/util/cpp/options.c
index 429cad75..00e6e721 100644
--- a/util/cpp/options.c
+++ b/util/cpp/options.c
@@ -44,6 +44,7 @@ do_option(text)
 	case 'P' :	/* run preprocessor stand-alone, without #'s	*/
 		options[*(text-1)] = 1;
 		break;
+	case 'A' :	/* for Amake */
 	case 'd' :	/* dependency generation */
 		do_dependencies = 1;
 		if (*text) {