diff --git a/fpu/softfloat-macros.h b/fpu/softfloat-macros.h
index 783822820..54c0bad2a 100644
--- a/fpu/softfloat-macros.h
+++ b/fpu/softfloat-macros.h
@@ -1,3 +1,8 @@
+/*
+ * QEMU float support macros
+ *
+ * Derived from SoftFloat.
+ */
 
 /*============================================================================
 
diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h
index adc5adad6..4add93c9c 100644
--- a/fpu/softfloat-specialize.h
+++ b/fpu/softfloat-specialize.h
@@ -1,3 +1,8 @@
+/*
+ * QEMU float support
+ *
+ * Derived from SoftFloat.
+ */
 
 /*============================================================================
 
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 30b07e9b4..e800daa01 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -1,3 +1,8 @@
+/*
+ * QEMU float support
+ *
+ * Derived from SoftFloat.
+ */
 
 /*============================================================================
 
diff --git a/fpu/softfloat.h b/fpu/softfloat.h
index fd61dc4b2..9e1072745 100644
--- a/fpu/softfloat.h
+++ b/fpu/softfloat.h
@@ -1,3 +1,9 @@
+/*
+ * QEMU float support
+ *
+ * Derived from SoftFloat.
+ */
+
 /*============================================================================
 
 This C header file is part of the SoftFloat IEC/IEEE Floating-point Arithmetic