diff --git a/src/storm/utility/string.cpp b/src/storm/utility/string.cpp
index 4d22f434f..46010525f 100644
--- a/src/storm/utility/string.cpp
+++ b/src/storm/utility/string.cpp
@@ -9,9 +9,13 @@ namespace storm {
                 // intentionally left empty.
             }
             
-            bool SimilarStrings::add(std::string const& string) {
+            bool SimilarStrings::isSimilar(std::string const& string) const {
                 double distance = levenshteinDistance(reference, string, caseSensitive);
-                if (distance <= static_cast<double>(std::max(reference.size(), string.size())) * (1.0 - similarityFactor)) {
+                return distance <= static_cast<double>(std::max(reference.size(), string.size())) * (1.0 - similarityFactor);
+            }
+            
+            bool SimilarStrings::add(std::string const& string) {
+                if (isSimilar(string)) {
                     distances.emplace(storm::utility::string::levenshteinDistance(reference, string, caseSensitive), string);
                     return true;
                 }
diff --git a/src/storm/utility/string.h b/src/storm/utility/string.h
index 332113341..bf2b501d0 100644
--- a/src/storm/utility/string.h
+++ b/src/storm/utility/string.h
@@ -18,6 +18,11 @@ namespace storm {
                  */
                 SimilarStrings(std::string reference, double similarityFactor = 0.6, bool caseSensitive = true);
                 
+                /*!
+                 * @return true, if the given string is considered similar.
+                 */
+                bool isSimilar(std::string const& string) const;
+                
                 /*!
                  * Adds the given string to the set of similar strings (if it is similar)
                  * @return true, if the given string is considered similar.
@@ -26,7 +31,6 @@ namespace storm {
                 
                 /*!
                  * Gets a list of all added strings that are similar to the reference string.
-                 * Erases all strings gathered so far.
                  */
                 std::vector<std::string> toList() const;