diff --git a/appendices/migration74/incompatible.xml b/appendices/migration74/incompatible.xml
index 384c132d970b..cd86a24395e9 100644
--- a/appendices/migration74/incompatible.xml
+++ b/appendices/migration74/incompatible.xml
@@ -249,6 +249,12 @@
    supported and resulted in corrupted reflection objects. It has been
    explicitly prohibited now.
   </para>
+
+  <para>
+   The values of the class constant of <classname>ReflectionClassConstant</classname>,
+   <classname>ReflectionMethod</classname> and <classname>ReflectionProperty</classname>
+   have changed.
+  </para>
  </sect2>
 
  <sect2 xml:id="migration74.incompatible.spl">
diff --git a/reference/reflection/reflectionclassconstant.xml b/reference/reflection/reflectionclassconstant.xml
index ab979c009d6e..c7466d5f43c7 100644
--- a/reference/reflection/reflectionclassconstant.xml
+++ b/reference/reflection/reflectionclassconstant.xml
@@ -41,16 +41,19 @@
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionclassconstant.constants.is-public">ReflectionClassConstant::IS_PUBLIC</varname>
+     <initializer>1</initializer>
     </fieldsynopsis>
     <fieldsynopsis>
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionclassconstant.constants.is-protected">ReflectionClassConstant::IS_PROTECTED</varname>
+     <initializer>2</initializer>
     </fieldsynopsis>
     <fieldsynopsis>
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionclassconstant.constants.is-private">ReflectionClassConstant::IS_PRIVATE</varname>
+     <initializer>4</initializer>
     </fieldsynopsis>
 
     <classsynopsisinfo role="comment">&Properties;</classsynopsisinfo>
@@ -114,6 +117,7 @@
        <para>
         Indicates <link linkend="language.oop5.visibility">public</link>
         constants.
+        Prior to PHP 7.4.0, the value was <literal>256</literal>.
        </para>
       </listitem>
      </varlistentry>
@@ -124,6 +128,7 @@
        <para>
         Indicates <link linkend="language.oop5.visibility">protected</link>
         constants.
+        Prior to PHP 7.4.0, the value was <literal>512</literal>.
        </para>
       </listitem>
      </varlistentry>
@@ -134,11 +139,19 @@
        <para>
         Indicates <link linkend="language.oop5.visibility">private</link>
         constants.
+        Prior to PHP 7.4.0, the value was <literal>1024</literal>.
        </para>
       </listitem>
      </varlistentry>
 
     </variablelist>
+    <note>
+     <para>
+      The values of these constants may change between PHP versions.
+      It is recommended to always use the constants
+      and not rely on the values directly.
+     </para>
+    </note>
    </section>
   </section>
 <!-- }}} -->
diff --git a/reference/reflection/reflectionclassconstant/getmodifiers.xml b/reference/reflection/reflectionclassconstant/getmodifiers.xml
index 910c460cc10b..9d04db297d22 100644
--- a/reference/reflection/reflectionclassconstant/getmodifiers.xml
+++ b/reference/reflection/reflectionclassconstant/getmodifiers.xml
@@ -27,8 +27,8 @@
   &reftitle.returnvalues;
   <para>
    A numeric representation of the modifiers.
-   The actual meanings of these modifiers are described in the
-   <link linkend="reflectionmethod.constants.modifiers">predefined constants</link>.
+   The actual meaning of these modifiers are described under
+   <link linkend="reflectionclassconstant.constants.modifiers">predefined constants</link>.
   </para>
  </refsect1>
 
diff --git a/reference/reflection/reflectionmethod.xml b/reference/reflection/reflectionmethod.xml
index 372d8558983f..7b5951a65fd1 100644
--- a/reference/reflection/reflectionmethod.xml
+++ b/reference/reflection/reflectionmethod.xml
@@ -46,37 +46,37 @@
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionmethod.constants.is-static">ReflectionMethod::IS_STATIC</varname>
-     <initializer>1</initializer>
+     <initializer>16</initializer>
     </fieldsynopsis>
     <fieldsynopsis>
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionmethod.constants.is-public">ReflectionMethod::IS_PUBLIC</varname>
-     <initializer>256</initializer>
+     <initializer>1</initializer>
     </fieldsynopsis>
     <fieldsynopsis>
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionmethod.constants.is-protected">ReflectionMethod::IS_PROTECTED</varname>
-     <initializer>512</initializer>
+     <initializer>2</initializer>
     </fieldsynopsis>
     <fieldsynopsis>
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionmethod.constants.is-private">ReflectionMethod::IS_PRIVATE</varname>
-     <initializer>1024</initializer>
+     <initializer>4</initializer>
     </fieldsynopsis>
     <fieldsynopsis>
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionmethod.constants.is-abstract">ReflectionMethod::IS_ABSTRACT</varname>
-     <initializer>2</initializer>
+     <initializer>64</initializer>
     </fieldsynopsis>
     <fieldsynopsis>
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionmethod.constants.is-final">ReflectionMethod::IS_FINAL</varname>
-     <initializer>4</initializer>
+     <initializer>32</initializer>
     </fieldsynopsis>
 
     <classsynopsisinfo role="comment">&Properties;</classsynopsisinfo>
@@ -136,46 +136,71 @@
      <varlistentry xml:id="reflectionmethod.constants.is-static">
       <term><constant>ReflectionMethod::IS_STATIC</constant></term>
       <listitem>
-       <para>Indicates that the method is static.</para>
+       <para>
+        Indicates that the method is static.
+        Prior to PHP 7.4.0, the value was <literal>1</literal>.
+       </para>
       </listitem>
      </varlistentry>
 
      <varlistentry xml:id="reflectionmethod.constants.is-public">
       <term><constant>ReflectionMethod::IS_PUBLIC</constant></term>
       <listitem>
-       <para>Indicates that the method is public.</para>
+       <para>
+        Indicates that the method is public.
+        Prior to PHP 7.4.0, the value was <literal>256</literal>.
+       </para>
       </listitem>
      </varlistentry>
 
      <varlistentry xml:id="reflectionmethod.constants.is-protected">
       <term><constant>ReflectionMethod::IS_PROTECTED</constant></term>
       <listitem>
-       <para>Indicates that the method is protected.</para>
+       <para>
+        Indicates that the method is protected.
+        Prior to PHP 7.4.0, the value was <literal>512</literal>.
+       </para>
       </listitem>
      </varlistentry>
 
      <varlistentry xml:id="reflectionmethod.constants.is-private">
       <term><constant>ReflectionMethod::IS_PRIVATE</constant></term>
       <listitem>
-       <para>Indicates that the method is private.</para>
+       <para>
+        Indicates that the method is private.
+        Prior to PHP 7.4.0, the value was <literal>1024</literal>.
+       </para>
       </listitem>
      </varlistentry>
 
      <varlistentry xml:id="reflectionmethod.constants.is-abstract">
       <term><constant>ReflectionMethod::IS_ABSTRACT</constant></term>
       <listitem>
-       <para>Indicates that the method is abstract.</para>
+       <para>
+        Indicates that the method is abstract.
+        Prior to PHP 7.4.0, the value was <literal>2</literal>.
+       </para>
       </listitem>
      </varlistentry>
 
      <varlistentry xml:id="reflectionmethod.constants.is-final">
       <term><constant>ReflectionMethod::IS_FINAL</constant></term>
       <listitem>
-       <para>Indicates that the method is final.</para>
+       <para>
+        Indicates that the method is final.
+        Prior to PHP 7.4.0, the value was <literal>4</literal>.
+       </para>
       </listitem>
      </varlistentry>
 
     </variablelist>
+    <note>
+     <para>
+      The values of these constants may change between PHP versions.
+      It is recommended to always use the constants
+      and not rely on the values directly.
+     </para>
+    </note>
    </section>
   </section>
 <!-- }}} -->
diff --git a/reference/reflection/reflectionmethod/getmodifiers.xml b/reference/reflection/reflectionmethod/getmodifiers.xml
index c0b9f1743795..8b6a1d1b98eb 100644
--- a/reference/reflection/reflectionmethod/getmodifiers.xml
+++ b/reference/reflection/reflectionmethod/getmodifiers.xml
@@ -26,8 +26,8 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   A numeric representation of the modifiers. The modifiers are listed below.
-   The actual meanings of these modifiers are described in the
+   A numeric representation of the modifiers.
+   The actual meaning of these modifiers are described under
    <link linkend="reflectionmethod.constants.modifiers">predefined constants</link>.
   </para>
  </refsect1>
@@ -70,10 +70,10 @@ echo implode(' ', Reflection::getModifierNames($bar->getModifiers()));
     <screen>
 <![CDATA[
 Modifiers for method foo():
-261
+49
 final public static
 Modifiers for method bar():
-65792
+1
 public
 ]]>
     </screen>
diff --git a/reference/reflection/reflectionproperty.xml b/reference/reflection/reflectionproperty.xml
index ad167fc4ad6e..43b1e2d0f145 100644
--- a/reference/reflection/reflectionproperty.xml
+++ b/reference/reflection/reflectionproperty.xml
@@ -41,25 +41,25 @@
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionproperty.constants.is-static">ReflectionProperty::IS_STATIC</varname>
-     <initializer>1</initializer>
+     <initializer>16</initializer>
     </fieldsynopsis>
     <fieldsynopsis>
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionproperty.constants.is-public">ReflectionProperty::IS_PUBLIC</varname>
-     <initializer>256</initializer>
+     <initializer>1</initializer>
     </fieldsynopsis>
     <fieldsynopsis>
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionproperty.constants.is-protected">ReflectionProperty::IS_PROTECTED</varname>
-     <initializer>512</initializer>
+     <initializer>2</initializer>
     </fieldsynopsis>
     <fieldsynopsis>
      <modifier>const</modifier>
      <type>int</type>
      <varname linkend="reflectionproperty.constants.is-private">ReflectionProperty::IS_PRIVATE</varname>
-     <initializer>1024</initializer>
+     <initializer>4</initializer>
     </fieldsynopsis>
 
     <classsynopsisinfo role="comment">&Properties;</classsynopsisinfo>
@@ -124,6 +124,7 @@
        <para>
         Indicates <link linkend="language.oop5.static">static</link>
         properties.
+        Prior to PHP 7.4.0, the value was <literal>1</literal>.
        </para>
       </listitem>
      </varlistentry>
@@ -134,6 +135,7 @@
        <para>
         Indicates <link linkend="language.oop5.visibility">public</link>
         properties.
+        Prior to PHP 7.4.0, the value was <literal>256</literal>.
        </para>
       </listitem>
      </varlistentry>
@@ -144,6 +146,7 @@
        <para>
         Indicates <link linkend="language.oop5.visibility">protected</link>
         properties.
+        Prior to PHP 7.4.0, the value was <literal>512</literal>.
        </para>
       </listitem>
      </varlistentry>
@@ -154,11 +157,19 @@
        <para>
         Indicates <link linkend="language.oop5.visibility">private</link>
         properties.
+        Prior to PHP 7.4.0, the value was <literal>1024</literal>.
        </para>
       </listitem>
      </varlistentry>
 
     </variablelist>
+    <note>
+     <para>
+      The values of these constants may change between PHP versions.
+      It is recommended to always use the constants
+      and not rely on the values directly.
+     </para>
+    </note>
    </section>
   </section>
 <!-- }}} -->
diff --git a/reference/reflection/reflectionproperty/getmodifiers.xml b/reference/reflection/reflectionproperty/getmodifiers.xml
index d4cce99ad61d..74683273b2c1 100644
--- a/reference/reflection/reflectionproperty/getmodifiers.xml
+++ b/reference/reflection/reflectionproperty/getmodifiers.xml
@@ -30,6 +30,8 @@
   &reftitle.returnvalues;
   <para>
    A numeric representation of the modifiers.
+   The actual meaning of these modifiers are described under
+   <link linkend="reflectionproperty.constants.modifiers">predefined constants</link>.
   </para>
  </refsect1>