diff --git a/configure.ac b/configure.ac
index e03fb57e..0a7edbc1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -61,7 +61,7 @@ AC_ARG_ENABLE(ssp,
 ])
 
 AC_ARG_ENABLE(asm,
-[AS_HELP_STRING(--disable-asm,Do not compile assembly code -- This disables all (including non-assembly) platform-specific optimizations on Unix systems)],
+[AS_HELP_STRING(--disable-asm,[Do not compile assembly code -- As a side effect, this disables CPU-specific implementations on non-Windows platforms. Only for use with targets such as WebAssembly and NativeClient.])],
 [
   AS_IF([test "x$enableval" = "xno"], [
     enable_asm="no"