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-rw-r--r--src/cmp.c2
-rw-r--r--src/diff.c2
-rw-r--r--src/diff3.c2
-rw-r--r--src/sdiff.c2
4 files changed, 4 insertions, 4 deletions
diff --git a/src/cmp.c b/src/cmp.c
index 0b9c710..04638e3 100644
--- a/src/cmp.c
+++ b/src/cmp.c
@@ -1,4 +1,4 @@
-/* cmp - compare two files byte by byte
+/* GNU cmp - compare two files byte by byte
Copyright (C) 1990-1996, 1998, 2001-2002, 2004, 2006-2007, 2009-2013,
2015-2018 Free Software Foundation, Inc.
diff --git a/src/diff.c b/src/diff.c
index 04131ce..474da1e 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -1,4 +1,4 @@
-/* diff - compare files line by line
+/* GNU diff - compare files line by line
Copyright (C) 1988-1989, 1992-1994, 1996, 1998, 2001-2002, 2004, 2006-2007,
2009-2013, 2015-2018 Free Software Foundation, Inc.
diff --git a/src/diff3.c b/src/diff3.c
index 0d31cf4..ec414a9 100644
--- a/src/diff3.c
+++ b/src/diff3.c
@@ -1,4 +1,4 @@
-/* diff3 - compare three files line by line
+/* GNU diff3 - compare three files line by line
Copyright (C) 1988-1989, 1992-1996, 1998, 2001-2002, 2004, 2006, 2009-2013,
2015-2018 Free Software Foundation, Inc.
diff --git a/src/sdiff.c b/src/sdiff.c
index b08bc74..caef59e 100644
--- a/src/sdiff.c
+++ b/src/sdiff.c
@@ -1,4 +1,4 @@
-/* sdiff - side-by-side merge of file differences
+/* GNU sdiff - side-by-side merge of file differences
Copyright (C) 1992-1996, 1998, 2001-2002, 2004, 2006-2007, 2009-2013,
2015-2018 Free Software Foundation, Inc.