diff --git a/docs/manual/CoreTypes/filterchain.html b/docs/manual/CoreTypes/filterchain.html
index 3093fd956..38c2245d2 100644
--- a/docs/manual/CoreTypes/filterchain.html
+++ b/docs/manual/CoreTypes/filterchain.html
@@ -420,7 +420,7 @@ user defined values.
 
 <H4>Example:</H4>
 
-This replaces occurences of the string &#64;DATE&#64; in the data
+This replaces occurrences of the string &#64;DATE&#64; in the data
 with today's date and stores it in the property ${src.file.replaced}
 <BLOCKQUOTE><PRE>
 &lt;tstamp/&gt;
@@ -967,7 +967,7 @@ This tokenizer treats <b>all</b> the input as a token. So be
 careful not to use this on very large input.
 <H4>Examples:</H4>
 
-Replace the first occurance of package with //package.
+Replace the first occurrence of package with //package.
 <BLOCKQUOTE><PRE>
 &lt;tokenfilter&gt;
       &lt;filetokenizer/&gt;
@@ -1135,7 +1135,7 @@ for an explanation of regex flags.</TD>
 </TABLE>
 <H4>Examples:</H4>
 
-Replace all occurances of "hello" with "world", ignoring case.
+Replace all occurrences of "hello" with "world", ignoring case.
 
 <BLOCKQUOTE><PRE>
 &lt;tokenfilter&gt;