diff --git a/src/database.py b/src/database.py
index 32da2a2..547abee 100644
--- a/src/database.py
+++ b/src/database.py
@@ -10,6 +10,9 @@ class Database:
 
         self.new = not os.path.exists(filename)
         self.db = sqlite3.connect(filename)
+
+        self.init("CREATE TABLE StepsDone ( step varchar(32) )")
+        self.commit()
     
     def execute(self, *args, **kwargs):
         return self.db.execute(*args, **kwargs)
diff --git a/src/word_stats.py b/src/word_stats.py
index 0462bee..341e8d6 100644
--- a/src/word_stats.py
+++ b/src/word_stats.py
@@ -42,6 +42,12 @@ class WordStats:
         return self.all_words
 
     def generate_renders(self):
+        step_name = 'generate_renders'
+        wc_done = self.db.execute("SELECT count(*) FROM StepsDone WHERE step=?", (step_name, )).fetchone()
+        if wc_done[0] == 1:
+            print("Skipping GenerateRenders, already complete")
+            return
+
         lemmas = [lemma for (lemma, ) in self.db.execute("SELECT DISTINCT lemma FROM UniqWords")]
         for lemma in progress(lemmas, 'word-count'):
             num_words = defaultdict(int)
@@ -51,6 +57,8 @@ class WordStats:
             for msd0, freq in num_words.items():
                 self.db.execute("INSERT INTO WordCount (lemma, msd0, frequency) VALUES (?,?,?)",
                     (lemma, msd0, freq))
+
+        self.db.execute("INSERT INTO StepsDone (step) VALUES (?)", (step_name, ))
         self.db.commit()
 
     def common_lemma_msd(self, lemma, msd):