diff --git a/include/keystone/keystone.h b/include/keystone/keystone.h
index 28ce0ce19df8f656905370f3bb7f1e60006f4f61..c8f83312ae59e21d13cda224f99ac93d5cb5f126 100644
--- a/include/keystone/keystone.h
+++ b/include/keystone/keystone.h
@@ -140,7 +140,7 @@ typedef enum ks_opt_value {
 	KS_OPT_SYNTAX_ATT   = 1 << 1, // X86 ATT asm syntax (KS_OPT_SYNTAX).
 	KS_OPT_SYNTAX_NASM  = 1 << 2, // X86 Nasm syntax (KS_OPT_SYNTAX).
 	KS_OPT_SYNTAX_MASM  = 1 << 3, // X86 Masm syntax (KS_OPT_SYNTAX) - unsupported yet.
-	KS_OPT_SYNTAX_GAS   = 1 << 4, // X86 GAS syntax (KS_OPT_SYNTAX)
+	KS_OPT_SYNTAX_GAS   = 1 << 4, // X86 GNU GAS syntax (KS_OPT_SYNTAX).
 } ks_opt_value;