diff --git a/devito/arch/compiler.py b/devito/arch/compiler.py
index a5486951ee6..c95a1ffb918 100644
--- a/devito/arch/compiler.py
+++ b/devito/arch/compiler.py
@@ -397,7 +397,7 @@ def __init__(self, *args, **kwargs):
             self.cflags.append('-mprefer-vector-width=512')
 
         if platform in [POWER8, POWER9]:
-           # -march isn't supported on power architectures
+           # -march isn't supported on power architectures, is -mtune needed?
            self.cflags = ['-mcpu=native']  + self.cflags
         else:
            self.cflags = ['-march=native'] + self.cflags