diff --git a/src/ast/act_cache.cpp b/src/ast/act_cache.cpp
index 0ee0afaac..1d1341184 100644
--- a/src/ast/act_cache.cpp
+++ b/src/ast/act_cache.cpp
@@ -40,7 +40,7 @@ Notes:
   The number of unused entries (m_unused) is equal to the number of entries
   of the form
        t -> (s, 0)
-  That is, it is the number of keys that were never accessed by cliend code.
+  That is, it is the number of keys that were never accessed by client code.
   
   The cache maintains at most m_max_unused entries.
   When the maximum number of unused entries exceeds m_max_unused, then
diff --git a/src/smt/smt_internalizer.cpp b/src/smt/smt_internalizer.cpp
index a420d85d9..df80d3281 100644
--- a/src/smt/smt_internalizer.cpp
+++ b/src/smt/smt_internalizer.cpp
@@ -656,10 +656,10 @@ namespace smt {
     /**
        \brief Enable the flag m_merge_tf in the given enode.  When the
        flag m_merge_tf is enabled, the enode n will be merged with the
-       true_enode (false_enode) whenever the boolean variable v is
+       true_enode (false_enode) whenever the Boolean variable v is
        assigned to true (false).
 
-       If is_new_var is true, then trail is not created for the flag uodate.
+       If is_new_var is true, then trail is not created for the flag update.
     */
     void context::set_merge_tf(enode * n, bool_var v, bool is_new_var) {
         SASSERT(bool_var2enode(v) == n);
@@ -674,8 +674,8 @@ namespace smt {
     }
 
     /**
-       \brief Trail object to disable the m_enode flag of a boolean
-       variable. The flag m_enode is true for a boolean variable v,
+       \brief Trail object to disable the m_enode flag of a Boolean
+       variable. The flag m_enode is true for a Boolean variable v,
        if there is an enode n associated with it.
     */
     class set_enode_flag_trail : public trail<context> {