diff --git a/include/bitcoin/blockchain/interface/block_chain.hpp b/include/bitcoin/blockchain/interface/block_chain.hpp
index bc48b14b..c2487ccf 100644
--- a/include/bitcoin/blockchain/interface/block_chain.hpp
+++ b/include/bitcoin/blockchain/interface/block_chain.hpp
@@ -107,10 +107,10 @@ class BCB_API block_chain
     // ------------------------------------------------------------------------
     // Not thread safe except as noted.
 
-    /// Set the crash lock scope (for use only with insert).
+    /// Set the flush lock scope (for use only with insert).
     bool begin_writes();
 
-    /// Reset the crash lock scope (for use only with insert).
+    /// Reset the flush lock scope (for use only with insert).
     bool end_writes();
 
     /// Insert a block to the blockchain, height is checked for existence.
diff --git a/include/bitcoin/blockchain/interface/fast_chain.hpp b/include/bitcoin/blockchain/interface/fast_chain.hpp
index 7e34acda..c6c694d4 100644
--- a/include/bitcoin/blockchain/interface/fast_chain.hpp
+++ b/include/bitcoin/blockchain/interface/fast_chain.hpp
@@ -86,10 +86,10 @@ class BCB_API fast_chain
     // Writers.
     // ------------------------------------------------------------------------ 
 
-    /// Set the crash lock scope (for use only with insert).
+    /// Set the flush lock scope (for use only with insert).
     virtual bool begin_writes() = 0;
 
-    /// Reset the crash lock scope (for use only with insert).
+    /// Reset the flush lock scope (for use only with insert).
     virtual bool end_writes() = 0;
 
     /// Insert a block to the blockchain, height is checked for existence.
diff --git a/src/interface/block_chain.cpp b/src/interface/block_chain.cpp
index 1f36fef5..99965f03 100644
--- a/src/interface/block_chain.cpp
+++ b/src/interface/block_chain.cpp
@@ -910,16 +910,16 @@ bool block_chain::stopped() const
 // Sequential locking helpers.
 // ----------------------------------------------------------------------------
 
-// Use to create crash lock scope around multiple closely-spaced inserts.
+// Use to create flush lock scope around multiple closely-spaced inserts.
 // This is a performance optimization that requires write_serial(..., false).
 bool block_chain::begin_writes()
 {
-    return database_.crash_lock();
+    return database_.flush_lock();
 }
 
 bool block_chain::end_writes()
 {
-    return database_.crash_unlock();
+    return database_.flush_unlock();
 }
 
 // private
diff --git a/src/pools/orphan_pool_manager.cpp b/src/pools/orphan_pool_manager.cpp
index 115e177b..f6d0dc03 100644
--- a/src/pools/orphan_pool_manager.cpp
+++ b/src/pools/orphan_pool_manager.cpp
@@ -69,7 +69,7 @@ bool orphan_pool_manager::start()
     subscriber_->start();
 
     ///////////////////////////////////////////////////////////////////////////
-    // Begin crash lock.
+    // Begin flush lock.
     return flush_ || fast_chain_.begin_writes();
 }
 
@@ -81,7 +81,7 @@ bool orphan_pool_manager::stop()
     subscriber_->invoke(error::service_stopped, 0, {}, {});
 
     return flush_ || fast_chain_.end_writes();
-    // End crash lock.
+    // End flush lock.
     ///////////////////////////////////////////////////////////////////////////
 }