diff --git a/doc/developer-notes.md b/doc/developer-notes.md
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -306,12 +306,8 @@
 
 - DumpAddresses : Dumps IP addresses of nodes to peers.dat.
 
-- ThreadFlushWalletDB : Close the wallet.dat file if it hasn't been used in 500ms.
-
 - ThreadRPCServer : Remote procedure call handler, listens on port 8332 for connections and services them.
 
-- BitcoinMiner : Generates bitcoins (if wallet is enabled).
-
 - Shutdown : Does an orderly shutdown of everything.
 
 Ignoring IDE/editor files
@@ -425,6 +421,18 @@
   - *Rationale*: Easier to understand what is happening, thus easier to spot mistakes, even for those
   that are not language lawyers
 
+- Initialize all non-static class members where they are defined
+
+  - *Rationale*: Initializing the members in the declaration makes it easy to spot uninitialized ones,
+  and avoids accidentally reading uninitialized memory
+
+```cpp
+class A
+{
+    uint32_t m_count{0};
+}
+```
+
 Strings and formatting
 ------------------------
 
@@ -444,6 +452,23 @@
 The shadowing warning (`-Wshadow`) is enabled by default. It prevents issues rising
 from using a different variable with the same name.
 
+E.g. in member initializers, prepend `_` to the argument name shadowing the
+member name:
+
+```c++
+class AddressBookPage
+{
+    Mode m_mode;
+}
+
+AddressBookPage::AddressBookPage(Mode _mode) :
+      m_mode(_mode)
+...
+```
+
+When using nested cycles, do not name the inner cycle variable the same as in
+upper cycle etc.
+
 Please name variables so that their names do not shadow variables defined in the source code.
 
 Threads and synchronization
diff --git a/src/miner.cpp b/src/miner.cpp
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -32,12 +32,6 @@
 #include <queue>
 #include <utility>
 
-//////////////////////////////////////////////////////////////////////////////
-//
-// BitcoinMiner
-//
-
-//
 // Unconfirmed transactions in the memory pool often depend on other
 // transactions in the memory pool. When we select transactions from the
 // pool, we select by highest priority or fee rate, so we might consider