diff --git a/build.bat b/build.bat
index af3c29b..5f5097b 100644
--- a/build.bat
+++ b/build.bat
@@ -6,6 +6,6 @@ if not exist ".\build" mkdir ".\build"
 
 pushd .\build
 
-cl /Zi ..\src\main.c /Feapp.exe /Od /nologo /I..\src 
+cl /Zi ..\src\main.c /Feapp.exe /Od /nologo /I..\src
 
 popd .\build
diff --git a/docs/CHANGELOG b/docs/CHANGELOG
index 2628180..503b74d 100644
--- a/docs/CHANGELOG
+++ b/docs/CHANGELOG
@@ -1,3 +1,7 @@
+12-04-2024  René Huiberts  <rhuibertsjr@gmail.com>
+
+	Updated: references & documentation
+
 12-04-2024  René Huiberts  <rhuibertsjr@gmail.com>
 
 	Added: project layout
diff --git a/docs/HASH_TABLE b/docs/HASH_TABLE
new file mode 100644
index 0000000..c813e29
--- /dev/null
+++ b/docs/HASH_TABLE
@@ -0,0 +1,9 @@
+
+=== HASH TABLE =================================================================
+
+  1. Calling the hash-function with the same input, should always return the
+     same output.
+  2. Hash output should be unique.
+  3. Computing a hash should be fast, the whole point of a hash table is fast
+     lookup time.
+  4. Hash output should be "random".
\ No newline at end of file
diff --git a/docs/REFERENCES b/docs/REFERENCES
index 5d5419c..7250d47 100644
--- a/docs/REFERENCES
+++ b/docs/REFERENCES
@@ -1,5 +1,8 @@
 
 === REFERENCES =================================================================
 
-  [1] Strager (2023) " Faster than Rust and C++: the PERFECT hash table"
-      https://www.youtube.com/watch?v=DMQ_HcNSOAI
\ No newline at end of file
+  [1] Strager (2023) "Faster than Rust and C++: the PERFECT hash table"
+      https://www.youtube.com/watch?v=DMQ_HcNSOAI
+
+  [2] J. Sorber (2020) " Understanding and implementing a Hash Table (in C)"
+      https://www.youtube.com/watch?v=2Ti5yvumFTU
\ No newline at end of file
diff --git a/start.bat b/start.bat
index 1aad84c..0585435 100644
--- a/start.bat
+++ b/start.bat
@@ -6,4 +6,4 @@ pushd build
 
 .\app.exe
 
-popd 
+popd