diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 75182ed788..93ad9d0df0 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2020-02-11  Christian Biesinger  <cbiesinger@google.com>
+
+	* arch/arm.h (enum gdb_regnum): Add comment for the FP0..7
+	registers.
+
 2020-02-11  Christian Biesinger  <cbiesinger@google.com>
 
 	* arm-tdep.c (arm_dump_tdep): Add \n in fprintf.
diff --git a/gdb/arch/arm.h b/gdb/arch/arm.h
index 13f030af82..2d9e87eb42 100644
--- a/gdb/arch/arm.h
+++ b/gdb/arch/arm.h
@@ -31,6 +31,7 @@ enum gdb_regnum {
   ARM_SP_REGNUM = 13,		/* Contains address of top of stack */
   ARM_LR_REGNUM = 14,		/* address to return to from a function call */
   ARM_PC_REGNUM = 15,		/* Contains program counter */
+  /* F0..F7 are the fp registers for the (obsolete) FPA architecture.  */
   ARM_F0_REGNUM = 16,		/* first floating point register */
   ARM_F3_REGNUM = 19,		/* last floating point argument register */
   ARM_F7_REGNUM = 23, 		/* last floating point register */