diff --git a/src/blackmisc/containerbase.h b/src/blackmisc/containerbase.h
index ed9b7b1b8..7586938eb 100644
--- a/src/blackmisc/containerbase.h
+++ b/src/blackmisc/containerbase.h
@@ -86,7 +86,7 @@ namespace BlackMisc
         }
 
         /*!
-         * \brief Return true if there is an element for which a given predicate returns true
+         * \brief Return true if there is an element for which a given predicate returns true.
          */
         template <class Predicate>
         bool contains(Predicate p) const
@@ -96,8 +96,6 @@ namespace BlackMisc
 
         /*!
          * \brief Return true if there is an element equal to given object
-         * \param object is this object in container?
-         * \return
          */
         bool contains(const T &object) const
         {
diff --git a/src/blackmisc/sequence.h b/src/blackmisc/sequence.h
index f706e3c83..500fb4343 100644
--- a/src/blackmisc/sequence.h
+++ b/src/blackmisc/sequence.h
@@ -249,6 +249,7 @@ namespace BlackMisc
 
         /*!
          * \brief Remove elements for which a given predicate returns true.
+         * \pre The sequence must be initialized.
          */
         template <class Predicate>
         void removeIf(Predicate p)
@@ -269,6 +270,7 @@ namespace BlackMisc
 
         /*!
          * \brief Remove the given object, if it is contained.
+         * \pre The sequence must be initialized.
          */
         void remove(const T &object)
         {
@@ -305,6 +307,7 @@ namespace BlackMisc
 
         /*!
          * \brief Replace elements for which a given predicate returns true. If there is no match, push the new element on the end.
+         * \pre The sequence must be initialized.
          */
         template <class Predicate>
         void replaceOrAdd(Predicate p, const T &replacement)
@@ -315,6 +318,7 @@ namespace BlackMisc
 
         /*!
          * \brief Replace elements matching the given element. If there is no match, push the new element on the end.
+         * \pre The sequence must be initialized.
          */
         void replaceOrAdd(const T &original, const T &replacement)
         {
@@ -326,6 +330,7 @@ namespace BlackMisc
          * \brief Replace elements matching a particular key/value pair. If there is no match, push the new element on the end.
          * \param key1 A pointer to a member function of T.
          * \param value1 Will be compared to the return value of key1.
+         * \pre The sequence must be initialized.
          */
         template <class K1, class V1>
         void replaceOrAdd(K1 key1, V1 value1, const T &replacement)