diff --git a/README.md b/README.md
index ece7c9f..64af037 100644
--- a/README.md
+++ b/README.md
@@ -261,25 +261,7 @@ The following are available operators:
 Predicate control
 -----------------
 
-```c++
-peg parser("NUMBER  <-  [0-9]+");
-
-parser["NUMBER"] = [](const char* s, size_t n) {
-    return stol(string(s, n), nullptr, 10);
-};
-
-parser["NUMBER"].predicate = [](const char* s, size_t n, const any& val, const any& dt) {
-    return val.get<long>() == 100;
-};
-
-long val;
-auto ret = parser.parse("100", val);
-assert(ret == true);
-assert(val == 100);
-
-ret = parser.parse("200", val);
-assert(ret == false);
-```
+  * TODO
 
 Adjust definitions
 ------------------
diff --git a/peglib.h b/peglib.h
index 90a0760..107e4e2 100644
--- a/peglib.h
+++ b/peglib.h
@@ -279,10 +279,12 @@ any call(F fn, Args&&... args) {
     return any(fn(std::forward<Args>(args)...));
 }
 
+#if 0
 /*
  * Predicate
  */
 typedef std::function<bool(const char* s, size_t n, const any& val, const any& dt)> Predicate;
+#endif
 
 class Action
 {
@@ -1233,7 +1235,9 @@ public:
 
     std::string                   name;
     size_t                        id;
+#if 0
     Predicate                     predicate;
+#endif
     std::vector<Action>           actions;
     std::function<std::string ()> error_message;
     bool                          ignoreSemanticValue;
@@ -1300,10 +1304,12 @@ inline size_t Holder::parse(const char* s, size_t n, SemanticValues& sv, Context
             val = reduce(chldsv, dt, action);
         }
 
+#if 0
         // Predicate check
         if (success(len) && outer_->predicate && !outer_->predicate(anchors, anchorn, val, dt)) {
             len = -1;
         }
+#endif
 
         c.pop();
     });
diff --git a/test/test.cc b/test/test.cc
index 0442f43..1c58e25 100644
--- a/test/test.cc
+++ b/test/test.cc
@@ -484,6 +484,7 @@ TEST_CASE("Calculator test with AST", "[general]")
     REQUIRE(val == -3);
 }
 
+#if 0
 TEST_CASE("Predicate test", "[general]")
 {
     peg parser("NUMBER  <-  [0-9]+");
@@ -504,6 +505,7 @@ TEST_CASE("Predicate test", "[general]")
     ret = parser.parse("200", val);
     REQUIRE(ret == false);
 }
+#endif
 
 TEST_CASE("Ignore semantic value test", "[general]")
 {