diff --git a/reference/intl/grapheme/grapheme-strstr.xml b/reference/intl/grapheme/grapheme-strstr.xml
index de94750387..54a1694821 100644
--- a/reference/intl/grapheme/grapheme-strstr.xml
+++ b/reference/intl/grapheme/grapheme-strstr.xml
@@ -15,7 +15,7 @@
    <methodparam choice="opt"><type>bool</type><parameter>before_needle</parameter><initializer>false</initializer></methodparam>
   </methodsynopsis>
   <para>
-   Returns part of haystack string from the first occurrence of needle to the end of haystack.
+   Returns part of haystack string from the first occurrence of needle to the end of haystack (including the needle).
   </para> 
  </refsect1>
 
@@ -44,7 +44,7 @@
      <listitem>
       <para>
        If &true;, grapheme_strstr() returns the part of the
-       haystack before the first occurrence of the needle.
+       haystack before the first occurrence of the needle (excluding the needle).
       </para>
      </listitem>
     </varlistentry>
diff --git a/reference/mbstring/functions/mb-strstr.xml b/reference/mbstring/functions/mb-strstr.xml
index 880505aa50..095c5ae4f5 100644
--- a/reference/mbstring/functions/mb-strstr.xml
+++ b/reference/mbstring/functions/mb-strstr.xml
@@ -50,9 +50,9 @@
        Determines which portion of <parameter>haystack</parameter>
        this function returns. 
        If set to &true;, it returns all of  <parameter>haystack</parameter>
-       from the beginning to the first occurrence of <parameter>needle</parameter>.
+       from the beginning to the first occurrence of <parameter>needle</parameter> (excluding needle).
        If set to &false;, it returns all of <parameter>haystack</parameter>
-       from the first occurrence of <parameter>needle</parameter> to the end,
+       from the first occurrence of <parameter>needle</parameter> to the end (including needle).
       </para>
      </listitem>
     </varlistentry>
diff --git a/reference/strings/functions/strstr.xml b/reference/strings/functions/strstr.xml
index 02f5d7559a..31c39d86e4 100644
--- a/reference/strings/functions/strstr.xml
+++ b/reference/strings/functions/strstr.xml
@@ -15,7 +15,7 @@
    <methodparam choice="opt"><type>bool</type><parameter>before_needle</parameter><initializer>false</initializer></methodparam>
   </methodsynopsis>
   <para>
-   Returns part of <parameter>haystack</parameter> string from the first
+   Returns part of <parameter>haystack</parameter> string starting from and including the first
    occurrence of <parameter>needle</parameter> to the end of
    <parameter>haystack</parameter>.
   </para>
@@ -61,7 +61,7 @@
       <para>
        If &true;, <function>strstr</function> returns
        the part of the <parameter>haystack</parameter> before the first
-       occurrence of the <parameter>needle</parameter>.
+       occurrence of the <parameter>needle</parameter> (excluding the needle).
       </para>
      </listitem>
     </varlistentry>