--- a/js/src/builtin/TestingFunctions.cpp
+++ b/js/src/builtin/TestingFunctions.cpp
@@ -162,18 +162,18 @@ GetBuildConfiguration(JSContext *cx, uns
 }
 
 static JSBool
 GC(JSContext *cx, unsigned argc, jsval *vp)
 {
     /*
      * If the first argument is 'compartment', we collect any compartments
      * previously scheduled for GC via schedulegc. If the first argument is an
-     * object, we collect the object's compartment (any any other compartments
-     * scheduled for GC). Otherwise, we collect call compartments.
+     * object, we collect the object's compartment (and any other compartments
+     * scheduled for GC). Otherwise, we collect all compartments.
      */
     JSBool compartment = false;
     if (argc == 1) {
         Value arg = vp[2];
         if (arg.isString()) {
             if (!JS_StringEqualsAscii(cx, arg.toString(), "compartment", &compartment))
                 return false;
         } else if (arg.isObject()) {