diff --git a/util/topgen/LLlex.c b/util/topgen/LLlex.c
index 53ad5ec4..9a0c9378 100644
--- a/util/topgen/LLlex.c
+++ b/util/topgen/LLlex.c
@@ -1,3 +1,4 @@
+/* $Header$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
diff --git a/util/topgen/hash.c b/util/topgen/hash.c
index 4a847ed8..e1190544 100644
--- a/util/topgen/hash.c
+++ b/util/topgen/hash.c
@@ -1,3 +1,4 @@
+/* $Header$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
diff --git a/util/topgen/main.c b/util/topgen/main.c
index 7e4ff75f..635b83ca 100644
--- a/util/topgen/main.c
+++ b/util/topgen/main.c
@@ -1,3 +1,4 @@
+/* $Header$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
diff --git a/util/topgen/misc.h b/util/topgen/misc.h
index 37405eb3..e06b502c 100644
--- a/util/topgen/misc.h
+++ b/util/topgen/misc.h
@@ -1,3 +1,4 @@
+/* $Header$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
diff --git a/util/topgen/pattern.c b/util/topgen/pattern.c
index 9c9ca9f6..ca075185 100644
--- a/util/topgen/pattern.c
+++ b/util/topgen/pattern.c
@@ -1,3 +1,4 @@
+/* $Header$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
diff --git a/util/topgen/symtab.c b/util/topgen/symtab.c
index 9e697898..7bc38af1 100644
--- a/util/topgen/symtab.c
+++ b/util/topgen/symtab.c
@@ -1,3 +1,4 @@
+/* $Header$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
diff --git a/util/topgen/symtab.h b/util/topgen/symtab.h
index 06e88b38..7960a030 100644
--- a/util/topgen/symtab.h
+++ b/util/topgen/symtab.h
@@ -1,3 +1,4 @@
+/* $Header$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
diff --git a/util/topgen/token.h b/util/topgen/token.h
index 6779f860..5f2f3fd0 100644
--- a/util/topgen/token.h
+++ b/util/topgen/token.h
@@ -1,3 +1,4 @@
+/* $Header$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
diff --git a/util/topgen/topgen.g b/util/topgen/topgen.g
index 96dfd32f..3f02ad12 100644
--- a/util/topgen/topgen.g
+++ b/util/topgen/topgen.g
@@ -1,3 +1,4 @@
+/* $Header$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".
diff --git a/util/topgen/tunable.h b/util/topgen/tunable.h
index 675a6b17..1d1957d0 100644
--- a/util/topgen/tunable.h
+++ b/util/topgen/tunable.h
@@ -1,3 +1,4 @@
+/* $Header$ */
 /*
  * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
  * See the copyright notice in the ACK home directory, in the file "Copyright".