diff --git a/doc/src/fix_ttm.rst b/doc/src/fix_ttm.rst
index c2b4f2cf97..d146321395 100644
--- a/doc/src/fix_ttm.rst
+++ b/doc/src/fix_ttm.rst
@@ -217,7 +217,7 @@ units used.
 .. note::
 
   The electronic temperature at each grid point must be a non-zero
-  positive value, both initially, and as the temperature evovles over
+  positive value, both initially, and as the temperature evolves over
   time.  Thus you must use either the *set* or *infile* keyword or be
   restarting a simulation that used this fix previously.