diff --git a/Doc/lib/libcodecs.tex b/Doc/lib/libcodecs.tex
index 8a2417eb5b9..bf461d49a8b 100644
--- a/Doc/lib/libcodecs.tex
+++ b/Doc/lib/libcodecs.tex
@@ -93,21 +93,21 @@ additional functions which use \function{lookup()} for the codec
 lookup:
 
 \begin{funcdesc}{getencoder}{encoding}
-Lookup up the codec for the given encoding and return its encoder
+Look up the codec for the given encoding and return its encoder
 function.
 
 Raises a \exception{LookupError} in case the encoding cannot be found.
 \end{funcdesc}
 
 \begin{funcdesc}{getdecoder}{encoding}
-Lookup up the codec for the given encoding and return its decoder
+Look up the codec for the given encoding and return its decoder
 function.
 
 Raises a \exception{LookupError} in case the encoding cannot be found.
 \end{funcdesc}
 
 \begin{funcdesc}{getincrementalencoder}{encoding}
-Lookup up the codec for the given encoding and return its incremental encoder
+Look up the codec for the given encoding and return its incremental encoder
 class or factory function.
 
 Raises a \exception{LookupError} in case the encoding cannot be found or the
@@ -116,7 +116,7 @@ codec doesn't support an incremental encoder.
 \end{funcdesc}
 
 \begin{funcdesc}{getincrementaldecoder}{encoding}
-Lookup up the codec for the given encoding and return its incremental decoder
+Look up the codec for the given encoding and return its incremental decoder
 class or factory function.
 
 Raises a \exception{LookupError} in case the encoding cannot be found or the
@@ -125,14 +125,14 @@ codec doesn't support an incremental decoder.
 \end{funcdesc}
 
 \begin{funcdesc}{getreader}{encoding}
-Lookup up the codec for the given encoding and return its StreamReader
+Look up the codec for the given encoding and return its StreamReader
 class or factory function.
 
 Raises a \exception{LookupError} in case the encoding cannot be found.
 \end{funcdesc}
 
 \begin{funcdesc}{getwriter}{encoding}
-Lookup up the codec for the given encoding and return its StreamWriter
+Look up the codec for the given encoding and return its StreamWriter
 class or factory function.
 
 Raises a \exception{LookupError} in case the encoding cannot be found.