diff --git a/src/BlockFile.h b/src/BlockFile.h
index cca57df94..c49004ce8 100644
--- a/src/BlockFile.h
+++ b/src/BlockFile.h
@@ -122,7 +122,8 @@ class PROFILE_DLL_API BlockFile /* not final, abstract */ {
    void SilenceLog() const { mSilentLog = TRUE; }
 
    ///when the project closes, it locks the blockfiles.
-   ///Override this in case it needs special treatment
+   ///Override this in case it needs special treatment.
+   // not balanced by unlocking calls.
    virtual void CloseLock(){Lock();}
 
    /// Prevents a read on other threads.  The basic blockfile runs on only one thread, so does nothing.
diff --git a/src/Sequence.h b/src/Sequence.h
index 3230c1373..1c1665063 100644
--- a/src/Sequence.h
+++ b/src/Sequence.h
@@ -149,9 +149,11 @@ class PROFILE_DLL_API Sequence final : public XMLTagHandler{
    //
 
    bool Lock();
-   bool CloseLock();//similar to Lock but should be called upon project close.
    bool Unlock();
 
+   bool CloseLock();//similar to Lock but should be called upon project close.
+   // not balanced by unlocking calls.
+
    //
    // Manipulating Sample Format
    //
diff --git a/src/WaveClip.h b/src/WaveClip.h
index f670bd47e..a208a4d14 100644
--- a/src/WaveClip.h
+++ b/src/WaveClip.h
@@ -343,10 +343,12 @@ public:
 
    /// Lock all blockfiles
    void Lock();
-   void CloseLock(); //similar to Lock but should be called when the project closes.
    /// Unlock all blockfiles
    void Unlock();
 
+   void CloseLock(); //similar to Lock but should be called when the project closes.
+   // not balanced by unlocking calls.
+
    ///Delete the wave cache - force redraw.  Thread-safe
    void DeleteWaveCache();
 
diff --git a/src/WaveTrack.h b/src/WaveTrack.h
index 82a8a649b..c630e8b56 100644
--- a/src/WaveTrack.h
+++ b/src/WaveTrack.h
@@ -286,9 +286,11 @@ class AUDACITY_DLL_API WaveTrack final : public Track {
    //
 
    bool Lock();
-   bool CloseLock(); //similar to Lock but should be called when the project closes.
    bool Unlock();
 
+   bool CloseLock(); //similar to Lock but should be called when the project closes.
+   // not balanced by unlocking calls.
+
    /** @brief Convert correctly between an (absolute) time in seconds and a number of samples.
     *
     * This method will not give the correct results if used on a relative time (difference of two
diff --git a/src/blockfile/ODPCMAliasBlockFile.cpp b/src/blockfile/ODPCMAliasBlockFile.cpp
index eadddc63d..36db432d7 100644
--- a/src/blockfile/ODPCMAliasBlockFile.cpp
+++ b/src/blockfile/ODPCMAliasBlockFile.cpp
@@ -129,7 +129,8 @@ void ODPCMAliasBlockFile::Lock()
       PCMAliasBlockFile::Lock();
 }
 
-//when the file closes, it locks the blockfiles, but it calls this so we can check if it has been saved before.
+//when the file closes, it locks the blockfiles, but only conditionally.
+// It calls this so we can check if it has been saved before.
 void ODPCMAliasBlockFile::CloseLock()
 {
    if(mHasBeenSaved)
diff --git a/src/blockfile/ODPCMAliasBlockFile.h b/src/blockfile/ODPCMAliasBlockFile.h
index 432348716..b08db4ced 100644
--- a/src/blockfile/ODPCMAliasBlockFile.h
+++ b/src/blockfile/ODPCMAliasBlockFile.h
@@ -127,7 +127,9 @@ class ODPCMAliasBlockFile final : public PCMAliasBlockFile
    void SetFileName(wxFileName &name) override;
    wxFileName GetFileName() const override;
 
-   //when the file closes, it locks the blockfiles, but it calls this so we can check if it has been saved before.
+   //when the file closes, it locks the blockfiles, but only conditionally.
+   // It calls this so we can check if it has been saved before.
+   // not balanced by unlocking calls.
    void CloseLock() override;
 
    /// Prevents a read on other threads.