diff --git a/README.md b/README.md
index e09fc27..c04c59e 100644
--- a/README.md
+++ b/README.md
@@ -85,7 +85,7 @@ variant of Bob Jenkins [ISAAC](http://en.wikipedia.org/wiki/ISAAC_%28cipher%29)
 
 ##### Minor options
 
-Use `-DED25519_INLINE_ASM` to disable the use of custom assembler routines and instead rely on portable C.
+Use `-DED25519_NO_INLINE_ASM` to disable the use of custom assembler routines and instead rely on portable C.
 
 Use `-DED25519_FORCE_32BIT` to force the use of 32 bit routines even when compiling for 64 bit.
 
@@ -180,4 +180,4 @@ with extreme values to ensure they function correctly. SSE2 is now supported.
 
 #### Papers
 
-[Available on the Ed25519 website](http://ed25519.cr.yp.to/papers.html)
\ No newline at end of file
+[Available on the Ed25519 website](http://ed25519.cr.yp.to/papers.html)