diff --git a/doc/programmer/command.tex b/doc/programmer/command.tex
index 95382780..b8467eb6 100644
--- a/doc/programmer/command.tex
+++ b/doc/programmer/command.tex
@@ -226,7 +226,7 @@ A valid SICS object structure has to look like this:
 Please note that the first item in the data structure MUST be a
 pointer to an SICS object descriptor. Add your own stuff below
 that. If you do not adhere to this requirement, SICS will dump core on
-you rather sooner then later. 
+you rather sooner than later. 
 
 
 SICS needs this object descriptor for its own internal purposes. The
@@ -566,7 +566,7 @@ This code also shows the necessary error checking. It also shows how
 to check for possible interrupts after such an operation. It is very
 advisable to do this because the user may have interrupted the
 process. And she might not be all to happy if the new command just
-continues with the next step rather then aborting the process.
+continues with the next step rather than aborting the process.
 
 
 \section{SICS Interfaces}\label{interface}\label{inter}