diff --git a/documentation/ethercat_doc.tex b/documentation/ethercat_doc.tex
index f7e6af5d..d65a0569 100644
--- a/documentation/ethercat_doc.tex
+++ b/documentation/ethercat_doc.tex
@@ -758,7 +758,7 @@ position is now 1, so slave 3 is attached.
 
 \end{enumerate}
 
-f the master sources are configured with \lstinline+--enable-wildcards+, then
+If the master sources are configured with \lstinline+--enable-wildcards+, then
 \lstinline+0xffffffff+ matches every vendor ID and/or product code.
 
 %------------------------------------------------------------------------------