--- a/js/src/jsemit.cpp
+++ b/js/src/jsemit.cpp
@@ -5222,17 +5222,17 @@ js_EmitTree(JSContext *cx, JSCodeGenerat
         if (pn2) {
             /*
              * Top-level or called-from-a-native JS_Execute/EvaluateScript,
              * debugger, and eval frames may need the value of the ultimate
              * expression statement as the script's result, despite the fact
              * that it appears useless to the compiler.
              *
              * API users may also set the JSOPTION_NO_SCRIPT_RVAL option when
-             * calling JS_Compile* suppress JSOP_POPV.
+             * calling JS_Compile* to suppress JSOP_POPV.
              */
             useful = wantval =
                 !(cg->treeContext.flags & (TCF_IN_FUNCTION | TCF_NO_SCRIPT_RVAL));
             if (!useful) {
                 if (!CheckSideEffects(cx, cg, pn2, &useful))
                     return JS_FALSE;
             }