diff --git a/hcore/deviceManager/deviceSpecp.yy b/hcore/deviceManager/deviceSpecp.yy
index 88b277e..fa0a98f 100644
--- a/hcore/deviceManager/deviceSpecp.yy
+++ b/hcore/deviceManager/deviceSpecp.yy
@@ -17,7 +17,7 @@
  * lexer must have the same prefix as the parser they generate. So we just use
  * this #define below to override yacc/bison's presumed prefix for the lexer.
  */
-#error "Yacc should have defined yylex, and we need to override it to tell yacc the name of our lex function."
+#error "Yacc should have defined yylex as a preprocessor token, and we need to override it to tell yacc the name of our lex function."
 #endif
 #undef yylex
 #define yylex deviceSpecllex